Category: Football

When FIFA Opened the Data: How the World Cup Is Changing the Way We Understand the Game

For most of my career, the richest data in elite football sat behind closed doors. Tracking systems, multi-camera optical feeds, possession context, off-the-ball movement — the kind of information that actually explains why a match unfolds the way it does — was the private property of a handful of federations and clubs wealthy enough to own it. Everyone else worked with shots, corners, fouls and possession percentage, and squinted to fill in the rest.

That is changing, and the FIFA World Cup has become the most visible stage for the shift. Over the last two tournaments FIFA has done something I think is genuinely important for our field: it has taken some of the most modern performance data ever produced in football and made a meaningful slice of it public. As someone who has spent years arguing that data only becomes knowledge when people are allowed to interrogate it, I find this exciting — so I wanted to write down where this data lives, who is doing interesting things with it, and why the act of sharing matters as much as the numbers themselves.

FIFA’s initiative: Enhanced Football Intelligence

The centrepiece is Enhanced Football Intelligence (EFI) — the set of metrics that first appeared as those small graphics in the corner of the screen during the 2022 World Cup. EFI was built by FIFA’s Football Performance Analysis & Insights team to move us beyond traditional counting stats and toward metrics that describe how a team plays.

What makes EFI different is its source. Rather than relying only on on-the-ball event data, it combines event data with live tracking data from every player on the pitch, captured by a multi-camera optical system. When something happens, you know where all twenty-two players were in relation to it. That positional context is what unlocks metrics you simply cannot derive from a traditional stats sheet, including:

  • Line breaks — how often a pass cuts through an entire defensive unit, and whether it went through, around or over. FIFA’s own analysis shows that the more line breaks a team concedes in midfield, the more games it tends to lose.
  • Ball recovery time — how long, on average, it takes a team to win the ball back after losing it.
  • “In contest” possession — the honest third category that sits between “our ball” and “their ball,” capturing the messy phases when nobody is truly in control.
  • Receptions behind the midfield and defensive lines — where and how players make themselves available between the opponent’s units.
  • Pressure on the ball and forced turnovers — whether a side is genuinely disrupting the opponent or merely looking busy.

Crucially, FIFA makes this available to the public. The metrics are explained — with video and multilingual PDFs — on the FIFA Training Centre, and snippets of match data are published after games. For the 2026 tournament FIFA has gone further still, layering on two new initiatives: the FIFA Power Rankings, an objective player-rating system scoring every outfield player 0–10 for attacking, creativity and defending using EFI algorithms; and FIFA AI Pro, which gives all 48 teams the same generative-AI tools to explore match data and rebuild moments in 3D — explicitly framed as democratising analytics that used to belong only to the biggest budgets.

Where to find the data and the people working with it

Here are the sites I’d point any coach, analyst or curious fan toward. I’ve grouped them deliberately, because one distinction matters a great deal and is easy to miss: some of these work directly from data officially published by FIFA, while others produce excellent World Cup analysis using third-party providers such as StatsBomb. All are worth your time — but knowing which is which keeps you honest about where a number actually came from.

The official source

FIFA Training Centre

This is the well from which everything else is drawn. Free, open, and aimed at coaches of every level, it hosts the EFI metric explainers, the “Football Language” glossary, video breakdowns, the FIFA Insight interviews with the people who built EFI, and — the part I’d flag for 2026 — the Match Report Hub, a live index of post-match summary reports for every World Cup match, organised by group and added as the tournament unfolds. If you only bookmark one link from this article, make it this one.

Working directly with FIFA’s published reports

Tactics Journal

The sharpest example I’ve seen of someone treating FIFA’s openness as a system rather than a curiosity. Tactics Journal points out that FIFA is publishing a roughly 52-page post-match summary for every group-stage game — formations, pressing phases, line-break tables player-by-player, defensive pressure maps, sprint-zone physical data — all in a consistent structure. Their argument is that because every report follows the same layout, you can parse all of them into a structured, auditable evidence layer for scouting and tournament-wide tactical questions. They call it “tactical infrastructure,” and I think that’s exactly the right way to think about it: the PDF is content; the structured layer you build from it is infrastructure.

EFI Data Reference

An independent blog that does something quietly useful: it organises and explains the EFI metrics as a reference, pulling together the definitions of phases of play, line heights, team lengths, receptions and the rest into one navigable place. A patient companion to the official material that helps a newcomer go from “what is a line break?” to actually reading a match through that lens.

Doğan Parlak’s open-source EFI implementation

My favourite example of why open methods matter as much as open data. Parlak built an open-source implementation of FIFA’s EFI metrics — data, concept and visualisation layers — with the explicit goal of reproducing FIFA’s match reports and testing whether the published concepts are specified well enough to be rebuilt by an outsider. That is science in the best sense: take the published method, try to recreate it, and flag the ambiguities. For analysts and students it doubles as a practical toolkit for generating EFI-style visualisations. You can read his Master’s thesis on this project here.

The wider analytics and data-journalism ecosystem

These don’t all run on FIFA’s own feed, but they show what a culture of shared football data makes possible — and they’re some of the most engaging World Cup analysis being published right now.

Northeastern Global News — NGN Offside / NetSI Sport

A blog “powered by data science and written by journalists,” produced by Northeastern’s Network Science Institute (the NetSI Sport group led by Brennan Klein). It’s a masterclass in turning event data into narrative: passing networks and passing-cluster maps that fingerprint a team’s style, xG shot maps, dribble-and-carry graphics, and genuinely novel angles like whether the 2026 hydration breaks are changing scoring patterns. Worth knowing that their underlying data comes from Hudl StatsBomb (over 3,400 events per match), not FIFA’s EFI feed — a good illustration of how the official and commercial data worlds sit side by side.

Datawrapper — Data Vis Dispatch

Not a football site at all, but a weekly roundup of the best data visualisations from newsrooms around the world, and during the tournament it’s been a reliable showcase of World Cup charts — qualification journeys, the evolution of the match ball, player and game analyses from the likes of Reuters, The New York Times and El País. The best place to see how professional data journalists choose to present this kind of information. Some details are also here.

Microsoft Fabric Community — FIFA World Cup 2026 Stats Analysis Hub

A reminder that you don’t need a newsroom to do this. This is a community-built interactive Power BI dashboard — one example aimed at World Cup Fantasy players, with a “Stat View” toggle to compare a player’s club versus international form before making transfer decisions — sitting within Fabric’s wider Data Stories Gallery of user-made World Cup dashboards. A nice window into the grassroots, build-it-yourself end of the spectrum.

(Two more worth a look in the same spirit: Tactical Football Analysis for written post-match tactical breakdowns, and Flourish, whose football chart templates are a quick way to build your own tournament visualisations.Also, have a look at this substack on how to build team-shape visualisations.)

What the analysis actually looks like

The reason this data is worth sharing is that it produces visuals that change how you see a match. A few of the workhorse formats:

  • Pass networks map who connects to whom and where, turning a team’s structure into a readable shape — you can see at a glance whether a side is building through its full-backs, overloading one flank, or bypassing midfield entirely.
  • Tracking heatmaps show where players and teams actually spend their time, exposing the difference between nominal position and real behaviour, and revealing how compact or stretched a side is in and out of possession.
  • xG (expected goals) shot maps put a probability on every chance so you can judge whether a team created genuine danger or simply accumulated low-value shots — useful, as long as you remember it’s a guide, not a verdict.

The principle underneath all of them is the same one I keep coming back to: the best statistics don’t make football more complicated, they make it easier to understand. A line-break count, a compactness number or a clean sprint map isn’t there to replace the coach’s eye — it’s there to sharpen the question the coach is already asking as well as providing additional information for support staff to improve how players are prepared.

The other half of the story: injuries and player health

It would be a strange omission, for me especially, to write about World Cup data and talk only about what happens when players are on the pitch. The same tournament that generates all this performance data also generates a great deal of information about the cost of playing it — and FIFA itself frames its data mission broadly, as unlocking the potential of video and data to drive technical development and education, not just tactical analysis.

This World Cup has put player load firmly in the spotlight. The expansion to 48 teams and 104 matches, layered on top of an already congested club calendar, has prompted warnings from sports-medicine specialists that fatigue and tight scheduling are pushing injury rates up — with the knee particularly exposed to the constant cutting, pivoting and rapid changes of direction the modern game demands. FIFA’s own venue medical staff have pointed to the injuries they see most often in elite players: ankle sprains, and hamstring and calf strains. None of that is new in kind, but the volume and the schedule are. At the end of each tournament there is always a published paper on the injury surveillance activities conducted by the FIFA medical team. If you want to read more about our experience at the FIFA 2022 World Cup you can read the following papers:

Serner A, Chamari K, Hassanmirzaei B, Moreira F, Bahr R, Massey A, Grimm K, Clarsen B, Tabben M. Time-loss injuries and illnesses at the FIFA world cup Qatar 2022. Sci Med Footb. 2025 Aug;9(3):275-282. doi: 10.1080/24733938.2024.2357568. Epub 2024 Jun 11. PMID: 38860817.

Schumacher YO, Kings D, Whiteley R, Dharman A, Taqtaq G, Mc Court P, Alkhelaifi K, Targett S, Holtzhausen L, Pieles GE, Dzendrowskyj P, Zikria BA, Bordalo M, Al Hussein I, D’Hooghe P, Al-Kuwari A, Cardinale M. Medical services at the FIFA world cup Qatar 2022. Br J Sports Med. 2023 Oct 27;58(1):42–9. doi: 10.1136/bjsports-2023-106855. Epub ahead of print. PMID: 37890964; PMCID: PMC10804010.

Bordalo M, Serner A, Yamashiro E, Al-Musa E, Djadoun MA, Al-Khelaifi K, Schumacher YO, Al-Kuwari AJ, Massey A, D’Hooghe P, Cardinale M. Imaging-detected sports injuries and imaging-guided interventions in athletes during the 2022 FIFA football (soccer) World Cup. Skeletal Radiol. 2025 Apr;54(4):819-828. doi: 10.1007/s00256-023-04451-z. Epub 2023 Sep 16. PMID: 37715819; PMCID: PMC11845536.

Bordalo M, Evans T, Allenjawi S, Targett S, Dzendrowskyj P, Al-Kuwari AJ, Cardinale M, D’Hooghe P. Management of radiology services during the 2022 FIFA football (soccer) World Cup. Skeletal Radiol. 2025 Apr;54(4):647-653. doi: 10.1007/s00256-023-04486-2. Epub 2023 Nov 9. PMID: 37943308; PMCID: PMC11845430.

Alsenoy KV, Raisi LA, Shamsi FA, Thomson A, D’Hooghe P. Service Planning and Provision During Qatar’s 2022 FIFA World Cup and 2023 AFC Asian Cup: Sports Podiatry. J Am Podiatr Med Assoc. 2025 Sep-Oct;115(5):24-176. doi: 10.7547/24-176. PMID: 41166158.

For the public, the most visible “injury data” is the running tracker — outlets such as ESPN, The Independent and others maintain live lists of who is ruled out or racing to be fit, and this tournament has tested several squads hard, with sides like Brazil and the Netherlands losing first-choice players before a ball was kicked. These are journalism rather than open datasets, but they perform a real function: a structured, continuously updated public record of availability.

FIFA has a long history of medical research around its tournaments, and the combination of tracking data (sprint loads, high-intensity distances, accelerations) with injury records is exactly the kind of linkage that could move us from counting injuries to understanding and preventing them. The performance data and the medical data are two halves of the same picture; sharing both is how we protect the players who generate it.

Why sharing the data matters

I want to close on the part I care about most, because it’s easy to treat “FIFA released some metrics” as a minor technical footnote. It isn’t.

It democratises insight. When tracking-derived data was private, the gap between the richest and poorest programmes was partly a data gap. Publishing EFI, and giving every World Cup team the same AI tools, narrows that gap. Insight stops being a function of budget alone.

It creates a shared language. When a coach in one country and an analyst in another can both point to the same definition of a line break or “in contest” possession, conversations get more precise and more productive. Common metrics are the grammar of a common discussion.

It invites scrutiny and reproducibility. The moment a method is public, people like Doğan Parlak can try to rebuild it, stress-test it, and improve it. That is exactly how a field matures — not by guarding methods, but by exposing them to challenge.

It stimulates new ways of analysing the game. This is the part that excites me as a scientist. Hand the same dataset to a hundred curious people and you will get analyses no single organisation would ever have commissioned. Open data is generative: it produces questions, tools and visualisations that wouldn’t otherwise exist, and the elite game gets smarter as a result.

Football has always been understood through stories and through the eye. What FIFA’s data initiative does is add a third lens — a transparent, shareable, contestable one — and then, remarkably, hand it to everyone. The numbers are interesting. But the decision to share them is what will change how we understand the game at the very highest level. So, well done to my FIFA colleagues for this initiative.

At Aspetar we have produced a special issue of our Journal dedicated to Football and the World Cup. You can access it by clicking on the cover page.

New Article Published

This work was a collaboration with colleagues at Center of Excellence for Sport Science and Coach Education, in East Tennessee State University.

J Sports Med Phys Fitness. 2014 Apr 9. [Epub ahead of print]

Repeated change-of-direction test for collegiate male soccer players.

Author information

  • 1Center of Excellence for Sport Science and Coach Education, Department of Kinesiology, Leisure, and Sport Science, East Tennessee State University, Johnson City, TN, USA – harahara10@hotmail.com.

Abstract

AIM:

The aim of the study was to investigate the applicability of a repeated change-of-direction (RCoD) test for NCAA Division-I male soccer players.

METHODS:

The RCoD test consisted of 5 diagonal direction changes per repetition with a soccer ball to be struck at the end. Each player performed 15 repetitions with approximately 10 seconds to jog back between repetitions. Data were collected in two sessions. In the first session, 13 players were examined for heart rate responses and blood lactate concentrations. In the second session, 22 players were examined for the test’s ability to discriminate the primary from secondary players (78.0 ± 16.1 and 10.4 ± 13.3 minutes per match, respectively).

RESULTS:

Heart rate data were available only from 9 players due to artifacts. The peak heart rate (200.2 ± 6.6 beats∙min1: 99.9 ± 3.0% maximum) and blood lactate concentration (14.8 ± 2.4 mmol∙L1 immediately after) resulted in approximately 3.5 and 6.4fold increases from the resting values, respectively. These values appear comparable to those during intense periods of soccer matches. In addition, the average repetition time of the test was found to discriminate the primary (4.85 ± 0.23 s) from the secondary players (5.10 ± 0.24 s) (p = 0.02).

CONCLUSION:

The RCoD test appears to induce physiological responses similar to intense periods of soccer matches with respect to heart rate and blood lactate concentration. Players with better average repetition times tend to be those who play major minutes.

Training team sports athletes: Periodization and planning strategies. Part 2

 

Time goes fast and I just realised how long ago I wrote the first part of this article. So, let’s try to start from where I left.

Monitoring training and avoiding mistakes was the topic I left the readers with. Generally speaking, technology in this field is moving very fast and in the very near future I envisage the ability to be able to monitor physiological and behavioural responses to training in team sport in real time, with the ability to make some sensible decisions to optimise training gains in team players.

Heart rate monitoring for example has become nowadays accepted standard practice in the team sports World and also in the Football/Soccer environment nowadays many training sessions are monitored to quantify the effort of the players and the characteristics of the drills employed by the coaches.

In order to quantify training intensity, due to the intermittent nature of team sports, time spent in various intensity zones is quantified. A simple classification is presented and it is based on defining zones with heart rate presented as a % of Heart Rate Max or Heart Rate Reserve.

Of course, in order to have a precise determination of such training zones it is important to measure Heart Rate Max rather then using the 220-age estimation.

Because of the linear relationship between the intensity of exercise and the perception of effort, a simple scale is proposed here:

 

Table

Heart Rate measurements can be used to define not only the overall intensity of the training session, but also the intensity and demands of individual sessions. This approach allows the coach/S&C coach to develop a database of drills which can impose on the players similar demands in order to be able to change sessions and reduce the boredom factor.

By using Heart Rate based measures in combination with blood lactate it is in fact  possible to compare game-specific drills with more generic drills such as intermittent sprinting and/or repeated sprints and verify the demands on the same player of such activities.

In the following example we can see how intermittent sprint drills (10s activity-20s rest) provided a similar physiological response to 3 vs.3 in Handball players.

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lactate

This suggests that when training time is limited, the use of well planned technical and tactical drills can represent a significant training stimulus. Of course, what is important to remember is the fact that game-like drills can be effective only if we know how demanding they are. The physiological responses to such drills depend in fact on the rules used in the drills, the space, the number of players and the quality of the players involved. Generalising data findings from other sources is not the way to plan training. In order to successfully implement game-like activities in your training programme requires accurate measurement of the physiological demands in your particular group of players.

In elite team sports athletes it is also effective to plan specific sessions in which game-like drills are combined with more generic repeated sprint drills. A practical example could be to alternate 10 minutes of a game-like drill with repeated sprint drills (such as shuttle runs etc.).

This approach can be very effective and can lead to improvements in aerobic capacity without the need to dedicate too much time to training activities which not involve technical and tactical elements. The following data are the yo-yo test distance scores of an elite handball team performing for one month training sessions characterised by game-like activities mixed with intermittent work.

 

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This is of course only part of the picture. In team sports we want athletes to be able to perform high-intensity movements for the duration of the game, but we also want them to be fast, strong and powerful. Strength training and monitoring activities aimed at maximising gains in this area of the players’ fitness are very important and will be now discussed.

Strength and speed

First of all, we have to take into account what kind of variables we are interested in. Acute variable can help us in understanding how a session is going and how it is affecting the player.

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Chronic variables can give us more information on how effective a period of training has been and where is our training programme leading to.

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The use of measurement tools to analyse single sessions can be a very useful way to understand how the athlete is coping with the load we have imposed on him/her and also to understand how fatiguing is the session. If heart rate monitoring is important to understand the physiological demands of game-like drills, we need to use some form of monitoring to understand the responses to strength training sessions. Iso-inertial dynamometers are becoming more and more affordable and can provide a good solution. Monitoring strength training sessions offers the following benefits:

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However the last point is the most important one: if your monitoring activity does not provide data which are useful to improve your training prescription you are just collecting data which will not impact on the quality of training!

The following is a typical example of monitoring a training session using a linear encoder during a Bench Press exercise. Two athletes are lifting the same weight, they both have similar 1RMs, however by measuring their power output during the set we can see how different fatigue patterns occur:

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If the aim of the session/programme is to maximise power output, we need the athletes to be able to produce power within 90-100% of their maximum power for the given load. By monitoring how they respond (provided that they are encouraged to perform the concentric phase of the lift as fast as possible), we can improve our training prescription by dividing sets and reps to make sure the target power output is attained for the total volume of reps we want the athlete to perform in our programme.

Why such focus on power and speed of movement? Simple, it seems that during rapid movements an increased activation of fast motor units or decreased activation of the slow ones may occur. So, if we aim to improve power and speed in our athlete we should always ask them to perform the concentric phase as fast as possible. The work of Linnamo et al. (2002) can explain in justifying such approach. In their study, Linnamo and coworkers had 6 subjects with different fiber type composition characteristics:

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This is what you would typically encounter in a team sports scenario. They asked the subjects to perform two types of sessions (explosive and heavy resistance):

[EE] 5 x 10 reps @40+ 6% of MVC

[HE] 5 x 10 reps @67 + 7% of MVC

MVC is the maximal voluntary contraction (measured isometrically).

image image

The difference in the median frequency of the surface EMG (after rectification and fast fourier transformation of the EMG raw signal) between the two modalities of exercise clearly suggest a difference in motor unit recruitment patterns when performing the two types of loading. Note that the sets and reps where the same, with a difference in external load and velocity of movement.

By measuring in real time such parameters it is possible to change the session while it is being performed (again, if the aim of such session is to improve power and speed). The following example from Lore Chiu and coworkers (2004) shows that if you are monitoring the speed of the barbell/weight stack and you observed a decrease in speed, of course by changing the external load you can make sure the speed of execution is increase and is matching what you planned for.

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The key message here is that we should still plan sessions with sets x reps x load, but we should be able to measure the output in order to make sure the athlete is performing what we require in order to maximise the adaptations and make sure he/she is not wasting time in the gym!

Monitoring strategies to identify recovery and readiness to train

While everyone tends to accept the general adaptation syndrome paradigm, whereby a training stimulus challenges homeostasis and takes a certain amount of time to be recovered. Very few people actually measure what it means and if it is possible to track the various phases of responses to a single training session.

 

The following approach is an example conducted with an Handball team using vertical jumping tests (in this case the Counter Movement Jump [CMJ]) before, during and after a session of plyometrics (approximately 200 jumps in total). You can see that while the team average score seems to be recovered within 24 hours of such session, some individuals have recovered (BP) and some haven’t (SO). Individualisation should be a fundamental approach to team sports! But if you don’t measure anything…how can you individualise? While everyone talks about it, I still see scarce evidence of this actually occurring, where are the data?

 

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Biochemical monitoring of training, long term monitoring of adaptations

I have already presented examples of monitoring training load and adaptations in some team sports showing that different approaches of periodisation can be used depending on the level and the performance goals of the team and both approaches can produce improvements in the players when it counts (http://marcocardinale.blogspot.com/2007/12/strength-training-in-volleyball.html) if you know what you are doing.

Testing modalities and ways of tracking individual and team progress have also been discussed here before. I will spend few words with regard to hormonal monitoring which is now becoming something everyone claims to be an expert in. I recently came across a lot of manufacturers which claim can sell devices able to measure quickly (almost realtime) salivary concentration of hormones (in particular Testosterone and Cortisol) and/or measure hormones in capillary blood.

I regret to inform all readers that to my knowledge there isn’t a single device which provides good reliability and validity of the measures taken, furthermore while measuring such things can be useful, it is still an expensive exercise which requires time and most of all real expertise not only in conducting the necessary assays to measure hormone concentration but also in understanding the validity and the meaning (and most of all the limitations) of the data collected.

To real make and impact, hormonal monitoring should be performed routinely, with many data points during the day, and following strict guidelines in terms of sample collection, storage, preparation and analysis. Collecting only baseline morning fasting hormonal measures might not help in explaining the bigger picture. In the example below, Cortisol levels are presented during the course of the day showing a clear circadian pattern. The Blue line represents “normal” patterns of cortisol secretion. The red and the black line represents alterations I have observed in some athletes following specific training periods. The red and black dots represent the single point, morning fasting sample. As you can see, having only 1 data point might mislead you….as clearly while the subject represented by the black line would appear to have lower cortisol values in the baseline sample, his cortisol pattern is different from normal and his cortisol values are actually overall higher during day and night suggesting some indications of overreaching/overtraining.

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There is a clear message here. Beware of the so called experts…hormonal monitoring is an interesting field, but still no conclusive evidence on how it actually work, most of all, very few people understand it but many are out there selling all sorts of services and “expertise”. The use of testosterone and cortisol as biomarkers to understand training adaptations is an interesting field but requires the appropriate knowledge of physiology, techniques and limitations in order to be used to make the “right calls” when it comes to training prescription. In the last few weeks I have been working with my colleagues Blair Crewther, Christian Cook, Robert Weatherby and Paul Lowe on an extensive literature review addressing the evidence and implications of the short term effects of testosterone and cortisol on training adaptations and performance. I will keep the readers up to date when such paper is published (hopefully soon).

 

Conclusions

Writing training programmes is a mix of art and science. The scientific model should drive any inquisitive strength and conditioning coach in designing appropriate and effective programmes. Team sports are challenging in terms of trying to maximise performance with strength and conditioning programmes. They are challenging because of the different types of athletes involved in them, the complexity of the performance requirements and the difficulties of seasons with cups, playoffs etc. The only way to succeed is to approach training with an “evidence-based” attitude. Trying to put in place measurements and monitoring tools able to inform and guide the training process. The devil is always in the details. Group analysis should be followed by individual analysis in order to develop individualised programmes aimed at maximising performance in each single athlete of your team. Statistical procedures should be used to understand and treat the data better, but the attitude towards such approach should be to gain a better understanding of training adaptations rather then trying to find what is significant at P<0.05. As my friend Will Hopkins wrote some time ago:

If a treatment shows an improvement with P<.01 it means that there is a probability of 99% of the treatment being effective.

HOWEVER

If you are terminally ill, would you take a pill that gives you 80% chances of surviving (P<.20)?

In athletics terms…if a training programme can give you 80% chances of a 2% improvement which could win you a gold medal…would you use it…or would you wait for P<0.05?