Wren · Volume Four · Performance

The Performance Playbook for soccer and lacrosse

Twelve seasons of sports psychology research, one card each, turned toward the things a player actually does: training, the set piece, the mistake, the streak, the nerves. Every number comes from the book's sourcing. What each finding can't tell you is on the card too. Seven of the cards come with a free tool that puts the finding to work.

The whole volume, in game order

Match day, start to finish

What the evidence supports at each point of a player's week. Each box points to the card that backs it and the free tool that does it.

From Tuesday's session to the final whistle

Soccer and lacrosse examples throughout. Almost none of these studies were run on soccer or lacrosse players. Where the sport is known, the card names it.

Training weekShort blocks on one named weakness
- Weak foot, off-hand stick, first touch under pressure
- Check every rep against a target
- Stop when focus fades
- Pickup games go in a separate column
Cards 10, 2 · Blocks
Training weekFilm one skill, count one number
- Phone video of your shot or faceoff
- Shots on target out of 20, logged weekly
- Drills that look like the game beat drills that don't
Card 2 · Blocks
Night beforeRehearse the set play in your head
- The order and timing of a corner or a man-up set
- Include the crowd and a bad start
- It adds to real reps and never replaces them
Card 3 · Picture
Warm-upRate your nerves 1 to 10
- Write the number down before kickoff
- After the game, note how you played
- Over a season, your own best range shows up
Card 8 · Charge
Set pieceSame short routine, every time
- Same steps back, one breath
- Hold a still last look on one spot
- One cue word that aims you, picked at practice
- Then stop coaching yourself and strike
Cards 6, 1, 4, 5 · Routine, Cue
After a mistakeA four-second reset
- A small gesture that ends the last play
- A breath
- One fixed point to look at
Card 1 · Zone
Run of playFeed the hot teammate, not the worse shot
- Streaks are real in practice data
- In games the defense adjusts to them
- A streak is not a license for a worse shot
Card 7 · Streak
Off daysSteady runs for the mood
- Sustained, moderately hard running
- An easy stroll and an all-out effort both did little
- Free play and trying things is fine, and lightly supported
Cards 9, 11

Part one

Training

What builds skill, how to spend practice time, and what the head can add.

Card 10 · Ten Thousand Hours

Cost 4Evidence 4Hype 4

The hours that count are the uncomfortable ones

Deliberate practice is the biggest lever a player controls. The "10,000 hours" rule attached to it was an average someone turned into a finish line.

Share of performance differences explained by practice (2014, 88 studies)

Games (chess)26%

Music21%

Sports18%

Education4%

Professions<1%

Berlin's ten best violinists at age 20

Roughly half had passed 10,000 hours. Half hadn't, and they were the best group in the study.

1993Berlin study: the best violinists averaged about 7,400 hours of practice by 18. Their average crossed roughly 10,000 at 20.

2008A bestseller called it the 10,000-Hour Rule. The phrase appears nowhere in the study.

201488 studies, 11,135 people: practice explained about 12% of performance overall, 18% in sports.

PartsThe real thing has four: a named weakness, full attention, feedback on every rep, and repetition with correction. It was rated among the least enjoyable things the violinists did.

SoccerAsk a coach to name one flaw, say left-foot first touch. Work only that, at a wall or target, and count the misses.

LacrosseWall ball on the off hand at a target, checking each rep, is practice. Strong-hand wall ball on autopilot is closer to exercise.

BothTwo or three short, hard blocks a day is a full load. A pickup game is great and "contains almost none" of this, so log it separately.

About 82% of the difference between players in sports sits outside practice: starting age, build, coaching, luck, as measured across pooled studies. Ericsson argued those studies diluted his definition. The research promises improvement far more confidently than it promises rank.

Use it: the free toolBlocks →Timed practice blocks on one named weakness, with a debrief that sets up the next block.

Ericsson, Krampe & Tesch-Römer 1993 · Macnamara, Hambrick & Oswald 2014 · Season 10

Card 2 · The False Start

Cost 3Evidence 3Hype 2

Forty-eight useful minutes

In 1938 the man who ran America's first sport psychology lab timed a big-league team's practice and found most of it was standing around. His fixes still read like a modern training plan.

A full day of 1938 Cubs spring training

1925Coleman Griffith opens the earliest known American lab built to study athletes.

1938He embeds with the Chicago Cubs. His list: more reps in less time, batting practice that looks like real at-bats, film of players' own mechanics, and tests so progress is a number.

1938-40Over 600 pages of reports. The club used "essentially none of it." The manager refused to let players watch film of their own swings.

MissHe also advised cutting a young first baseman. The player stayed and became the 1945 National League MVP.

AuditTime one session. Count minutes of real reps versus waiting in line.

Game-likeShoot against a live keeper or defender, dodge against pressure, not only cones and an empty net.

Film and countPhone video of your shot or faceoff. One number a week, like shots on target out of 20.

The Cubs never tried his plan, so there's no before-and-after result. And an expert's verdict on a player can be flat wrong.

Nearest toolBlocks →No tool of its own. Blocks carries the idea: practice time that actually counts.

Griffith's Cubs reports, 1938 to 1940 · Season 2

Card 3 · The Picture in the Head

Cost 2Evidence 3Hype 3

Rehearse the play. The picture won't win the game.

Mental rehearsal works, and works best on the thinking parts of a skill. It comes in below real practice.

Effect of mental practice by type of skill (1983, 60 studies)

Thinking-heavy: order, timing, decisions~1.44

Mostly movement~0.43

Strength0.20

How they compare

Physical ≥ mental + physical, same timeMental below physicalMental beats nothing

1972A three-step lab method: relax the body, rehearse the performance in detail, then rehearse it under game pressure.

1983Sixty studies weighed together: people who rehearsed in their heads beat people who didn't practice at all.

LaterMixing mental and physical practice still didn't beat the same time spent physically practicing.

Rule"You can usefully imagine your way through a routine's order and timing. You cannot usefully imagine your muscles stronger."

Set playsRun a corner routine, a man-up set or a clearing pattern in your head: who moves, when, where the ball goes.

Pressure versionPicture the penalty with the crowd, the whistle and a bad first touch. The calm version is "a day that is not coming."

InjuredBest use of all: when you can't practice physically. It never replaces field time when you can.

Picturing a result, the goal going in or the win, is the part with no support. The picture improves how you run the play, not the score.

Use it: the free toolPicture →Write a short rehearsal script for a set play and run it, eyes closed, at game tempo.

Suinn 1972 · Feltz & Landers 1983 · Season 3

Card 11 · The Improvisers

Cost 2Evidence 2Hype 3

Drill in practice. Play free in the game.

Brain scans of improvising musicians showed a region linked to self-monitoring quieting down. It's a real hint, from a very small sample.

Everyone ever scanned in these two studies

Playing from memoryMonitoring area active

ImprovisingMonitoring area quieter, self-expression area up

2008Six jazz pianists played a memorized piece, then improvised, on the same keyboard in a scanner.

2012Twelve rappers: a memorized verse, then freestyle. Same pattern.

ButOne researcher is on both papers. Neither measured whether the music was any good, or whether anyone was in flow.

RuleFreedom lands on the prepared: years of scales build what the stage releases.

Free playSmall-sided games and pickup with no coaching mid-play are a reasonable habit, as long as you call them a habit and not a proven method.

On top of basicsFreestyle moves, stick tricks and new angles work best on skills you've already drilled.

Be skepticalThe idea that brain scans prove you should turn your brain off is a big claim built on 18 musicians.

Evidence rated 2 of 4, "suggestive." Two small studies are the start of a literature, not a finding.

The toolNo tool, on purpose. Free play needs a field and friends, not software.

Limb & Braun 2008 · Liu et al. 2012 · Season 11

Card 9 · The Chemistry

Cost 2Evidence 3Hype 3

The runner's high is real. The endorphin story isn't.

The lift after a steady run survives every test so far. The explanation everyone repeats has failed them.

Where the chemical rise, and the mood lift, showed up (humans, 2012)

63 runners, 45 minutes, 2021

Opioid blockerEuphoria up, anxiety down

PlaceboEuphoria up, anxiety down

"The blockaded runners got high anyway." If endorphins caused it, the blocker should have stopped it.

2004Endorphins are too big to cross from the blood into the brain. The famous blood test measured "the wrong side of the wall."

2012Humans, dogs and ferrets on treadmills. Humans and dogs showed a chemical rise after steady running; ferrets didn't.

2015In mice, blocking the cannabinoid system erased the post-run calm. Blocking opioids didn't.

202222 studies: exercise overall didn't hurt thinking, but hard exercise did hurt the planning-type thinking.

Off-day runsFor the mood, a steady continuous run in the moderately hard range, not a stroll and not sprints.

SprintsBeep tests and suicides sit at the all-out end, where the lift was smallest. Train them for fitness, not mood.

All-out runningDuring hard, all-out running, complex decisions can suffer. Keep calls simple in those moments.

The new explanation is favored but unproven in people: the lab's own 2023 review says proof "has not yet been achieved." The mood also doesn't show up every time.

The toolNo tool, on purpose. A steady run needs no app.

Dietrich & McDaniel 2004 · Raichlen 2012 · Fuss 2015 · Siebers 2021 · Season 9

Part two

Match execution

Nerves, set pieces, mistakes and streaks. Most of the strongest evidence in the volume lives here.

Card 8 · The Curve

Cost 2Evidence 3Hype 4

There's no one right amount of nerves. Find yours.

The "inverted U" in every textbook was never measured. Your own best level of nerves is real, and a notebook can find it.

What the 1908 mouse study actually found

Shapes are sketches of the result, not plotted data. The word "arousal" isn't in the paper.

1908Mice learning a box: the hill appears only on the hard task

1955A psychologist draws the curve as theory, with no experiment behind it

1959A review attaches the 1908 name, and it's taught as law for 70 years

1978Personal "zones" research begins: every athlete's best level differs

MethodBefore each competition, rate how charged you feel. After, write down how it really went. Keep going until your good games cluster.

1999Pooled studies: athletes inside their own zone tended to do better than outside it. The book prints no effect size because it couldn't verify one.

Rule"Precision is charge-intolerant; effort is charge-hungry; know which one you are doing."

GameNerves 1-10How it wentvs. A4sharp, calm on the ballvs. B8rushed two passesvs. C5goodsample page layout, not real entries

Precision momentsPenalty, free kick, free-position shot: these tolerate less charge. Settle down for them.

Effort momentsGround-ball battles, pressing, a recovery sprint: these can take more charge.

TeammatesThe quiet one may not be under-hyped, and the loud one may not be over-hyped. Best levels differ.

The modern lab result that brought back a "hill" came from a simple seeing task, not a sport skill under pressure. Where the peak sits varies by person.

Use it: the free toolCharge →The nerves notebook: log charge before, result after, and see your own zone appear.

Yerkes & Dodson 1908 · Hebb 1955 · Hanin, from 1978 · Jokela & Hanin 1999 · Season 8

Card 6 · The Rituals

Cost 1Evidence 4Hype 2

Keep the routine. Drop the lucky socks.

The cheapest well-supported tool in the whole series. A lucky charm and a pre-kick routine look alike from the stands, and they tested completely differently.

The lucky ball: putts made out of ten

2010 "lucky ball"6.4

2010 plain ball4.8

2014: rerun with more than twice the people, plan locked in advance. The advantage came out near zero.

The routine (2021, about 800 athletes, 15 sports)

works under pressureand without itbeginnersexperiencedclearest on self-paced skills, penalties included

Long routines did no better than short ones. "Three bounces and a breath did the work of thirty."

1925Island fishermen used no magic in the safe lagoon and lots of it on the dangerous open sea. Ritual grows where control runs out.

1948Pigeons fed on a timer invented little dances anyway. Superstition forms on its own.

Test 1What does it claim? About you (steadiness, the same on-ramp): keep it. About luck: drop it.

Test 2What if you can't do it? A lost routine gets rebuilt. A lost lucky shirt is a crisis.

Penalty kickSame steps back, one breath, one look at the target, strike. Identical at training and in games.

Free-position shotThe same idea, kept short. Build it from a breath, a count and a look, which can't be lost.

Watch for creepA bad week adds a step. Cut back to what you could do in a strange field with someone waiting.

Strongest for self-paced skills. A faceoff or a live dodge is timed by the whistle or the defender, so the evidence fits those less well. The 2010 study was normal science of its time, not a scandal.

Use it: the free toolRoutine →Build your pre-kick sequence, rehearse it full-screen, and count reps and streaks.

Damisch 2010 · Calin-Jageman & Caldwell 2014 · Rupprecht, Tran & Gröpel 2021 · Season 6

Card 1 · Zone

Cost 2Evidence 3Hype 2

The quiet eye and the four-second reset

You can't switch the zone on. You can build the conditions for it, hold a stiller last look, and get back after a mistake.

The quiet eye (1996, first measured on free throws)

The reset, about four seconds

1 a small cue that ends the play2 a breath3 one fixed point

EyeExperts hold a longer, stiller last look than novices. It's been found in putting, shooting and penalty kicks.

StressUnder pressure, the quiet eye is one of the first things to go. Training it "appears to buy back some of what pressure takes away."

FlowThree conditions hold up best: one clear goal, fast feedback, and difficulty just past comfortable.

1954The four-minute mile fell May 6; Landy beat it 46 days later. He'd been close for a year and a half, so belief wasn't the whole story.

Penalty or free-positionPick one spot. Hold the look a beat longer than feels necessary, then go.

After a turnover or a goal againstTug your sleeve or tap your stick, breathe, look at one fixed thing. Practice it on a Tuesday so it's there on Saturday.

Shooting drillsOne goal you can say in a sentence, a target that tells you right away, set a little too hard.

"Nobody is sure why it works," and results vary between labs. A reset doesn't fix a technique problem. Nothing guarantees the zone.

Use it: the free toolZone →Set before you play, reset between plays, debrief after. Trains the conditions and the four-second reset.

Vickers 1996 · Csikszentmihalyi 1975 · Ravizza · Season 1

Card 4 · The Voice

Cost 1Evidence 3Hype 3

One word that aims you beats a pep talk

On precise skills, a short instruction to yourself beat motivational self-talk. Pick the word at practice, not on the spot.

How big the effects are, on one scale

Cue"Watch the seam." "That corner." "Smooth."Steers attention. Won on precise skills.

Cheer"Come on, let's go."Claims to change you. Weaker on precision.

201132 studies, 62 measured effects: self-talk works, moderately (.48). "It will not make anyone a different athlete."

WhereBigger gains on skills still being learned. Cues practiced over time beat phrases handed out on the day.

EffortOn effort and endurance, the cheer and the cue ran closer together.

2014Talking to yourself as "you" or by name eased stress in 7 studies, 585 people, but on speeches, not sport.

Set pieceOne word about the target or tempo ("that corner," "smooth"), picked on a Tuesday and said on every practice rep. No technique words on a kick you already own.

New skillLearning a new dodge or the weak foot is where a technique cue like "low and through" helps most.

Nerves before a gameTalk to yourself as "you" or by your own name instead of "I." Free to try, untested on the field.

Keep the cue about where you're aiming, not a lesson on a kick you already own. Talking yourself through grooved technique under pressure is how a grooved skill chokes (card 5).

Use it: the free toolCue →Pick one cue word per skill in advance. It rejects anything over three words.

Hatzigeorgiadis et al. 2011 · Kross et al. 2014 · Season 4

Card 5 · The Yips

Cost 2Evidence 4Hype 4

Choking comes from caring too much, not too little

The strongest mechanism in the book: under pressure, experts get worse when they start watching their own technique.

Golfers putting under two conditions (2001)

ExpertsDistracted: fineWatching their own stroke: worse

NovicesThe pattern reversedAttention on technique helped them

The skill that breaks is

well-learnedpreciseself-pacedwatched

"The hard throw survived. The easy one was destroyed." A diving play leaves no time to monitor; a routine throw is nothing but time.

1984Choking defined: performing below your own normal level under pressure. Rewards help effort tasks and can hurt skill tasks.

1992Putters who learned by rules got worse under pressure. Those who learned with fewer rules held.

200372 golfers: the yips runs from a neurological movement problem at one end to choking at the other, with many cases, the researchers suspected, in between.

Verdict"No nerve" is wrong twice: some cases are neurological, and the rest are made of care.

Before the kickDon't coach your own technique in the last seconds. Let the routine (card 6) hold your attention instead.

Expect the easy onesThe simple pass, the keeper's outlet, the routine clear are the moments that wobble under pressure. Now you know why.

TeammatesAfter a miss, drop "no nerve." The player who seizes up usually cared more, not less.

Two theories are both still live, distraction and self-monitoring. The neurological end isn't fixed by effort or attitude; that's a doctor's question.

Nearest toolRoutine →No tool of its own. The defense is a routine that holds your attention, so use Routine.

Baumeister 1984 · Masters 1992 · Beilock & Carr 2001 · Smith et al. (Mayo Clinic) 2003 · Season 5

Card 7 · The Hot Hand

Cost 1Evidence 3Hype 3

The streak is real. The defense knows too.

For thirty years science called the hot hand an illusion. Then two economists found a math error, and the streak came back, probably smaller than fans think.

Flip a fair coin 3 times. After a heads, how often heads?

TTTsits out

TTHsits out

HTT0

HTH0

THT0

THH1

HHT½

HHH1

What you'd expect1/2

Average of the six5/12

About 42%, on a coin with no streaks at all. So a shooter who came out no better after makes than his average was actually beating that baseline.

198591% of fans believed in the hot hand. A study of 26 college shooters found "no streakiness beyond chance," and that verdict ruled for 30 years.

2018Miller and Sanjurjo show the counting method was biased low in every short sequence.

FixedRecounted fairly, the same shooters hit roughly 13 points better after a streak of makes than after misses.

GamesIn live games the defense may shift to the hot player and the shots can get worse. In-game effects are "modest at best."

Feeding the hot playerReasonable, but a streak is "not a license" for a worse shot.

Being the hot playerAfter two goals, expect tighter marking. Keep picking the good shot.

Your own statsOne game is a short sequence. Don't decide you're streaky or cursed from it.

All of this data is basketball. The strongest evidence is same-shot, no-defense drills, which are closest to penalty and shooting-drill reps, not open play.

Use it: the free toolStreak →Flip a hundred thousand coins and watch the 5/12 bias show up for yourself.

Gilovich, Vallone & Tversky 1985 · Miller & Sanjurjo 2018 · Season 7

Part three

Before you pay

For mental-training programs, flow camps and anything sold with a big percentage.

Card 12 · The Industry

Cost 4Evidence 1Hype 4

Ask to meet the number's parent

The three famous "flow" statistics sound precise. Traced back, none of them measured anyone doing anything.

Where the three numbers come from

500%→More productive: executives in workshops guessing their own peak. Nothing measured.

490%→Faster learning: the cited press item doesn't contain the number.

700%→More creative: the seller's own survey of its customers.

The nearest real study

Claim: "490% faster"4.9

Real result~2.3

Novices in archery, golf and rifle reached a benchmark about 2.3 times faster with brain-feedback training for pre-shot calm. Not flow, and "2.3 is not 4.9."

TestDon't ask whether it's true. Ask "what is the source?" It takes a browser and ten minutes.

What's soldMost flow courses teach sleep, recovery, focus blocks, clear goals, feedback and nerve control, all of it free in any library.

HonestReal effects in this book are modest: routines strong, self-talk and imagery moderate, practice 12 to 26 percent. Nobody has earned a percentage for flow.

FairMost sellers aren't lying. "It runs fine on sincerity."

Camps and programsIf the pitch leans on a big multiplier, keep your money. The free versions are on these cards.

Pre-shot calmThe free version is the routine on card 6, evidence 4 of 4.

Expect ordinary days"Most days the work is only work." That isn't the method failing.

This card audits the numbers, not the people who bought the course. Someone who got better sleep and focus from one is still better off; they just paid for what's free.

Nearest toolAll seven tools →No tool, on purpose. The free versions of what these programs sell are the other seven.

Cranston & Keller 2013 · Kotler 2014 · Season 12

Index

All twelve on one map

Across: what it costs to do. Up: how well the research backs it. Color: how far the popular version runs ahead. Tap a practice to jump to its card.

Most of the best-supported tools are the cheapest ones

4 Strong

6 Routine

5 Don't narrate

10 Deliberate practice

3 Moderate

4 Cue word 7 Hot hand

1 Zone conditions 3 Rehearsal 8 Nerves notebook 9 Steady runs

2 Sport psychologist

2 Suggestive

11 Free play

1 Thin

12 Flow programs

1 Very low cost

2 Low

3 Moderate

4 High

Hype gap: 2 moderate 3 large 4 extreme

Ratings are one reader's judgment on the book's own scales, argued row by row in the Volume Four matrix. They don't rate how well anything works for you.