The Constraints Collective

Our mission is to transform practice environments in sport by equipping coaches with the knowledge, understanding and skills to bridge the gap between skill acquisition theory and practice.

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#106
Thursday · 40 min
Episode 105 You Can Tell By The Stance - Ian & Keith's August Monthly Catch-Up
This month, Ian Renshaw and Keith Davids work through a run of stories that all land on the same idea: the environment you train in writes itself into your technique, whether anyone designs it that way or not. Ian opens with a story from one of the Collective's members in India: a Mumbai coach, Amladi, who could sort a cricket trial into two groups just by their batting stance, correctly picking out which players had grown up on underarm gully cricket in the lanes of Dadar, Matunga and Shivaji Park, and which had grown up playing the overarm version around South Mumbai and the suburbs. Keith connects it to skill adaptation and the idea of learning to address the performance environment, not just coordinate an action within it. From there the conversation moves through Pete Arnott's work with Scottish golfers, whose short, tight links courses have produced accurate but short hitters, and how he manipulates practice environments to prepare players for different tour conditions. Keith shares a video sent by a colleague in Buenos Aires of Estudiantes de la Plata's La Osha training ground, deliberately left to the weather since the club's 1970s championship years, where academy players learn to control the ball on a surface that looks nothing like a manicured pitch. Ian follows with the Indian hockey team that lost its edge in stick skill once the game moved from rough turf to astroturf, Pele's adjustment to boots after growing up playing barefoot, and two stories from the London 2012 Olympics, a long jumper who had actually practised jumping into the wind, and a pole vaulter who trained indoors and got caught out by it. Keith closes on why "closed" and "open" skill is a less accurate way to describe this than tasks with more or less information, and more or less stability. --- If you're getting value from our podcast check out our membership options and coaching community at [www.theconstraintscollective.com](https://www.theconstraintscollective.com) where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective.
#104
August 21 · 41 min
#104 Mark O'Sullivan_August Guest Review
Ian Renshaw and Keith Davids revisit Episode 72 with Mark O'Sullivan (Norwegian School of Sport Sciences) — why coaches are rarely taught to observe, a goalkeeping skill that transferred in from Gaelic football with no instruction at all, and the coach's compass and player's compass Mark built as a discussion framework for task design.
#103
August 14 · 1 hr 7 min
#103 What Makes a Champion — Ian Renshaw & Keith Davids Review Gullich et al (2021)
# What Makes a Champion — Ian Renshaw & Keith Davids Review Gullich et al (2021) In this theory episode, Ian Renshaw and Keith Davids dig into Gullich, McNamara, and Hambrick's 2021 meta-analysis "What Makes a Champion: Early Multidisciplinary Practice, Not Early Specialization, Predicts World-Class Performance" — 51 studies, roughly 6,000 athletes, 15 countries, and a clear finding: world-class athletes specialised later, practised more broadly across other sports as children, and accumulated less total practice time in their main sport than national-level athletes who never quite made it. Keith takes the findings seriously and then asks what a meta-analysis of published, formally-coached athletes can never capture — the backyard cricket, Brazilian futsal, and Pacific Islands rugby pathways that produced champions without ever appearing in a peer-reviewed dataset. Ian tells the story of a talented under-17 cricketer who just wanted one day off to go surfing — a junior-senior paradox playing out in real time. And the conversation lands on why adaptability, not specialisation, may be the trait elite sport increasingly selects for. A grounded, practical look at one of talent development's most cited — and most misread — papers. --- If you're getting value from our podcast check out our membership options and coaching community at [www.theconstraintscollective.com](https://www.theconstraintscollective.com) where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective. Support the running of the podcast at [patreon.com/TheConstraintsCollective](https://patreon.com/TheConstraintsCollective).
#102
August 7 · 54 min
#102 Twenty Minutes From the Sea — Chris Button on Why the Pool Doesn't Prepare You for Open Water (Part Two)
In Part Two of this milestone two-part conversation, Ian Renshaw continues talking with Professor Chris Button (University of Otago) — this time about water safety and drowning prevention. New Zealand has one of the worst per-capita drowning rates in the world, and Chris argues the reason isn't swimming ability: it's that people learn to swim in a pool, an environment that shares almost nothing with the open water that actually threatens them. Chris walks through a study that puts the problem in miniature — taking swimmers out in a boat on calm water and asking them to judge the distance back to shore by eye. Good swimmers judged it reasonably well; poor swimmers were badly wrong, and consistently overestimated the distance, right before being asked to swim it. His tested fix is disarmingly simple: stop teaching open-water skills in a pool, and take children to the beach, the lake, or the river instead — concentrated blocks of real-environment practice that held up on retention three months later and translated into genuine self-rescue skills. Part Two of Two — Part One aired as Episode 100, tracing the PhD finding Chris still sees coaches average away. --- If you're getting value from our podcast check out our membership options and coaching community at [www.theconstraintscollective.com](https://www.theconstraintscollective.com) where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective. Support the running of the podcast at [patreon.com/TheConstraintsCollective](https://patreon.com/TheConstraintsCollective).
#101
July 31 · 52 min
#101 Nobody Plays in Perfect Conditions — Ian & Keith's July Monthly Catch-Up
In this month's catch-up, Ian Renshaw and Keith Davids work through a run of ideas connected by a single question: how do you prepare an athlete for the conditions, schedules, and pressure you can't control? Keith breaks down why the NBA's 82-games-in-170-days calendar has pushed coaches toward short, opponent-specific practice pockets instead of generic repetition, and Ian connects it to a piece of single-session design work he's been developing from psychology and psychiatry literature — what can actually change if you only get one go? The conversation moves through the constraints continuum, the pair's own distinction between 'constraining to afford' and constraining to 'potentiate', and a run of stories — a Silver Ferns netball shooter whose in-house scoring system took the pressure off a stat the opposition had learned to exploit, and England's Under-21s, where a rehearsed "stay in the green" call pulled a player back from the edge of a red card. Keith closes by naming the amber zone properly — dynamical systems theory's region of metastability — and why the job isn't to coach uncertainty out of performance, but to make sure athletes have already met it once before it counts. --- If you're getting value from our podcast check out our membership options and coaching community at [www.theconstraintscollective.com](https://www.theconstraintscollective.com) where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective. Support the running of the podcast at [patreon.com/TheConstraintsCollective](https://patreon.com/TheConstraintsCollective).
#100
July 17 · 37 min
#100 Use The Funnel, Not the Average Value: Chris Button on the PhD That Almost Wasn’t (Part One)
In this landmark 100th episode, Ian Renshaw and Keith Davids are joined by Professor Chris Button from the University of Otago, whose research has ranged from ball-catching biomechanics to basketball free throws to, more recently, why so many people drown. Chris's route into research wasn't inevitable — he turned down a PhD scholarship for a job as a wine specialist before one line from Keith ("your PhD is your passport anywhere") talked him back onto the academic path. The conversation traces the finding buried in that PhD that coaches still routinely average away: when Chris's group-level statistics on ball-catching showed no differences between participants, despite him watching them move differently in real time, the fix wasn't better instrumentation — it was refusing to average, and analysing individuals as individuals. Years later at Edinburgh, the same logic showed up in basketball free throws: novices varied early in the shot, experts showed a funnel, real variability at the start narrowing as the ball approached release. The skill wasn't the absence of variability, but the timing of when it was allowed to matter. They also dig into the interdisciplinary Manchester Metropolitan University cohort that shaped Chris's approach of arguing between frameworks rather than staying inside one — a method that carried him to Otago and, eventually, toward water safety research. Part One of Two — Part Two continues in August's Week One Guest Podcast. --- If you're getting value from our podcast check out our membership options and coaching community at [www.theconstraintscollective.com](https://www.theconstraintscollective.com) where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective. Support the running of the podcast at [patreon.com/TheConstraintsCollective](https://patreon.com/TheConstraintsCollective).
#99
July 10 · 1 hr 20 min
The Video Doesn't Show What Happened — Ian Renshaw & Keith Davids Review Schütz, Betsch & Plessner (2026), with guest Scott Russell
An emergency episode: VAR was dominating the World Cup news cycle, and a paper had just landed asking the exact question everyone was arguing about. Ian Renshaw and Keith Davids review Schütz, Betsch & Plessner's "The Impact of Video Speed on Intention Attribution" (Psychology of Sport & Exercise, 2026) — four experiments showing that slowing footage down increases how intentional an action looks, peaking at around 1.5 seconds before easing off again. For the first time on a theory paper episode, they bring in a guest: Scott Russell, a former referee now researching how officials incorporate social expectations into their decisions. Keith reframes the paper's cognitive explanation through an ecological lens — it's not just processing time, it's a change in the structure of information available to the viewer. Scott argues that video, even in real time, is never the event itself, just "the best artist's impression." Ian draws on his own occlusion research to show how arbitrary a single video frame really is. And the conversation lands on practical recommendations: closed, specific questions for VAR reviews, standard-speed footage as the default for disciplinary decisions, and rugby league referee Ashley Klein's decision to uphold a send-off despite video review as a model for trusting the on-field call. A timely, sharp look at why the frozen frame keeps lying to us in the same direction, every time. --- If you're getting value from our podcast check out our membership options and coaching community at [www.theconstraintscollective.com](https://www.theconstraintscollective.com) where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective.
#98
July 3 · 1 hr 5 min
#98 From the Pitch to the Algorithm — with Ben Teune
# From the Pitch to the Algorithm — with Ben Teune In this episode, Ian Renshaw and Keith Davids are joined by Ben Teune, Sports Scientist and Analytics Lead at the WTA (Women's Tennis Association), whose PhD work — embedded with the Western Bulldogs AFL club at Victoria University — tackles a problem every constraint-led coach runs into: you're told to "manipulate the task," but rarely given a principled way to decide what to manipulate. The conversation covers how to give representativeness a number using the specificity index and association rule mining, why looking at one constraint at a time is misleading when machine learning can surface which constraint *combinations* actually produce breakthroughs or breakdowns, and how clustering algorithms can classify drills by variability so coaches can build sessions with intentional exploration versus exploitation phases. Ben also walks through his "outnumber" research — the two distinct solutions players find when given an extra player, and how a coach can use that insight to shift team behaviour with a simple time constraint. Underpinning it all is Ian's standout line of the episode: start with the coaching problem, then find the data that answers it — not the other way around. --- If you're getting value from our podcast check out our membership options and coaching community at [www.theconstraintscollective.com](https://www.theconstraintscollective.com) where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective. Support the running of the podcast at [patreon.com/TheConstraintsCollective](https://patreon.com/TheConstraintsCollective).
#97
June 26 · 42 min
#97 Round Up 11 — Your Team Was 29 Points Up. Here's Why That's the Dangerous Part.
The San Antonio Spurs led Game 4 of the 2026 NBA Finals by 29 points and lost it on a tip-in with 1.2 seconds left — the biggest comeback in Finals history. Ian Renshaw and Keith Davids use it to argue momentum isn't a mindset problem but a stable attractor state (drawing on Gernigon, Briki & Eykens' dynamical systems model of psychological momentum) that has to be deliberately broken, not willed away. They trace the same idea through hydration-break goal-scoring stats, Shane Warne's between-ball theatre, the "plus" between cricket deliveries, and a community AFL warm-up that was quietly working against its own players. This month's free round-up pulls together June's guest episode (Michael Richardson), theory paper, and Daniel Lycett guest review. Members get the full monthly catch-up recording, early access to next month's guest conversation, and the hosts' position statement on "Constrain to Afford or Constrain to Potentiate?"
#96
June 19 · 51 min
Episode #96 Daniel Lycett Guest Review
Keith and Ian go back through Daniel Lycett's PE curriculum redesign from episode 81 — and pull apart what was really going on underneath it: context, donor sports, and designing tasks people can actually succeed at. Along the way: Lego therapy for autistic learners, team chess, a French badminton study, and why Keith won't smash newer players off the pickleball court.
#95
June 12 · 49 min
Before the Ball Moves: How International Footballers Gain Their Advantage
#95 Before the Ball Moves: How International Footballers Gain Their Advantage In this episode, Ian Renshaw and Professor Keith Davids explore the tension between practice tools and movement variability. Using Ian's experience with a golf putting mat as a springboard, they examine how template-based practice can encourage rigid repetition and ask whether this conflicts with Bernstein's principle of "repetition without repetition." The conversation covers degrees of freedom — how beginners freeze their movements and how skilled performers learn to exploit them — drawing on Ludovic Seifert's fascinating research with ice climbers and the 1964 work of AJ Templeton, who was quoting James Gibson on reading greens long before ecological dynamics had a name. --- If you're getting value from our podcast check out our membership options and coaching community at [www.theconstraintscollective.com](https://www.theconstraintscollective.com) where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective. Support the running of the podcast at [patreon.com/TheConstraintsCollective](https://patreon.com/TheConstraintsCollective).
#94
June 5 · 1 hr 13 min
The Constraints Collective Podcast with Michael Richardson
#94 The Constraints Collective Podcast with Michael Richardson In this episode, Ian Renshaw and Keith Davids are joined by Professor Michael Richardson from Macquarie University, a specialist in ecological psychology and computational modelling. Mike's work sits at a fascinating intersection of mathematics, AI, and human movement — and this conversation explores what that means for how we understand and coach sport. The discussion covers how simple constraints generate extraordinary complexity in sport (just as adding lines and rules to an open field creates beautiful, emergent games), and how Mike's lab is using neural networks to predict player decisions up to two seconds before they happen. They unpack the concept of "addressing the performance environment" — the often-invisible skill of how athletes position their bodies, vision, and attention to access the information they need — and why this subtle layer of preparation underlies almost every spectacular action we see in sport. The conversation also touches on explainable AI, recurrence analysis, and what multi-agent coordination patterns in team sports and even video gaming reveal about collective decision-making. A wide-ranging and thought-provoking episode for anyone interested in the science behind performance. --- If you're getting value from our podcast check out our membership options and coaching community at [www.theconstraintscollective.com](https://www.theconstraintscollective.com) where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective. Support the running of the podcast at [patreon.com/TheConstraintsCollective](https://patreon.com/TheConstraintsCollective).
#10
May 29 · 31 min
#93 Round Up 10
# Round Up 10 — May 2026 In this month's update, Ian Renshaw and Professor Keith Davids catch up on the latest from the Constraints Collective world before diving into a rich discussion on skill adaptation, movement variability, and the dangers of template-based practice. Using Ian's experience with a golf putting mat as a springboard, they explore Bernstein's principle of "repetition without repetition" and ask whether tools that prescribe exact movement patterns work against the kind of functional variability that underpins real skill development. The conversation moves into degrees of freedom — how beginners freeze their movements and how skilled performers learn to exploit them — drawing on Ludovic Seifert's fascinating research with ice climbers and the 1964 work of AJ Templeton, who was quoting James Gibson on reading greens long before ecological dynamics had a name. They also celebrate the release of the Palgrave Handbook of Creativity in Sport, which features multiple contributions from the TCC community, and share updates on a skill adaptability series that's rapidly gathering momentum. --- If you're getting value from our podcast check out our membership options and coaching community at [www.theconstraintscollective.com](https://www.theconstraintscollective.com) where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective. Support the running of the podcast at [patreon.com/TheConstraintsCollective](https://patreon.com/TheConstraintsCollective).
#92
May 21 · 45 min
#92 Zama Xolani Mofokeng
In this episode we are joined by Zama Xolani Mofokeng a South African gymnast from Tembisa, Gauteng Province who has broken world records for consecutive one-handed back handsprings, performed not in a gym, but on public streets. Zama shares his lived experiences of perceptual-motor learning, intrinsic motivation, environmental adaptation, and the constraints-led approach. If you're getting value from our podcast check out our membership options and coaching community at www.theconstraintscollective.com where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective. Support the running of the podcast at patreon.com/TheConstraintsCollective
#91
May 9 · 57 min
#91 Are you switched off from physical education and sport?
In this episode Ian and Keith discuss why millions of people are put off exercise for life by bad PE memories. The culprit? Traditional formats that reward the already-skilled and humiliate everyone else (the beep test being a prime offender). They discuss solutions to this problem and explain how small tweaks can make all the difference to people's experiences. If you're getting value from our podcast check out our membership options and coaching community at www.theconstraintscollective.com where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective. Support the running of the podcast at patreon.com/TheConstraintsCollective
#90
April 30 · 1 hr 38 min
#90 Dave Keelty and Sam McKenzie
In this episode we are joined by Dave Keelty and Sam McKenzie, high performance practitioners working at the cutting edge of sport. We explore talent development and coach development and New Zealand's "Balance is Better" philosophy, discussing how coaches can individualise training within team sport environments. Link to Dave's Deep Dive platform https://the-deep-dive-coaching.beehiiv.com/ If you're getting value from our podcast check out our membership options and coaching community at www.theconstraintscollective.com where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective. Support the running of the podcast at patreon.com/TheConstraintsCollective
#89
April 14 · 1 hr 2 min
#89 Exploring Niche Construction in Sport Coaching
What do beavers building dams have to do with coaching elite athletes? More than you'd think. In this episode, we dive into niche construction theory. A concept borrowed from evolutionary biology, and explore how coaches are constantly shaping the environments that shape their players. From Pep Guardiola transforming English football, to Sri Lanka losing its ability to play spin on perfect pitches, to why Pelé's barefoot training on uneven ground made him a genius. They unpack how the environments we design don't just teach skills, they select for them. And why the role of the coach isn't to bark instructions, but to build the niche. Whether you work with beginners or elite performers, this one's going to make you rethink every session you've ever run. 📄 Paper: Niche Construction in Sport Coaching: An Ecological Dynamics Analysis — Rothwell, Stone & Davids (2023), Sports Coaching Review https://www.tandfonline.com/doi/epdf/10.1080/21640629.2021.1974692?needAccess=true
#88
April 5 · 31 min
#88 Round Up 9
Should you ditch the bowling machine? The hidden cost of "convenient" practice What if the tools coaches rely on most are actually making athletes worse? In this roundup episode, Martyn, Keith, and Ian unpack a deceptively simple problem, getting young cricketers enough quality ball-facing time, and follow the thread all the way from 13-year-olds in the nets to Jannik Sinner's warm-up routine at the Melbourne Open. Along the way they tackle some big questions: Why did Tim Paine's batting explode the moment he stopped using the dog stick? What does an elite football team failing to string a single pass together tell us about warm-ups? And could a "skilled feeder" be the next big role in sports science support? Plus: why windy conditions might be your best training partner, the backyard game that quietly builds pressure-handling skills, and a teaser for the team's most ambitious project yet, a deep dive into skill adaptation and why it might be time to retire the term "skill acquisition" for good. If you're getting value from our podcast check out our membership options and coaching community at www.theconstraintscollective.com where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective. Support the running of the podcast at patreon.com/TheConstraintsCollective
#87
March 27 · 1 hr 2 min
#87 Tom Parry and Tyler Yearby
Dr Tom Parry is the Kinesiology Program Director in the College of Education and Human Development at Butler University, Indianapolis, USA. His area of expertise is motor-skill learning, and specifically the application of ecological dynamics to coaching. Dr Tyler Yearby is the Co-Founder and Co-Director of Education for Emergence, a sports movement skill education company that offers prerecorded coach education courses and interactive learning opportunities in helping athletes become more skillful players. Link to article: https://www.tandfonline.com/doi/pdf/10.1080/00336297.2024.2420759?casa_token=ha8RnMnO7PYAAAAA:RVWwgUvnb6JZ6KRTH5U7Pj7XnF_bK2e0xgWNMxBjfv0lI7cOZkMr7ejdB6xarZi3OCp_4JoDHIu8cg If you're getting value from our podcast check out our membership options and coaching community at www.theconstraintscollective.com where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective. Support the running of the podcast at patreon.com/TheConstraintsCollective
#86
March 19 · 30 min
#86 Podcast Summary 7 - Tabai Matson
If you're getting value from our podcast check out our membership options and coaching community at www.theconstraintscollective.com where you can access podcast summaries, narrated presentations, early release podcasts and monthly online meet ups with experts from the Constraints Collective. Support the running of the podcast at patreon.com/TheConstraintsCollective In this episode we revisit and unpack key insights from our conversation with high-performance rugby union coach Tabai Mattson. We reflect on the evolving nature of elite performance, particularly in light of the recent Six Nations tournament. The discussion explores how modern teams are finding success not through rigid structure alone, but through speed, adaptability, and what we describe as relational play. We dive into: What “cutting-edge” coaching really looks like in high-performance environments The shift from structured systems to more fluid, player-led interactions How pace, offloads, and decision-making are reshaping the game Why coaches need to rethink how they design and support learning environments Enjoy!

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