The Constraints Collective

Part Two of this month's guest podcast: Ian Renshaw and Marco Perazzo (filling in for Keith Davids) continue the conversation with MMA coach Adam Singer (SBG Athens). Adam's whole programming philosophy compresses to three words — "do the thing," scaled for safety and variability, judged only by whether it helps his practice.

The conversation covers what Adam now calls periodization of goals rather than periodization of constraints (broad and varied far from a fight, narrowing toward specificity as it nears), the staph infection that accidentally protected one of his fighters from a fight he'd have lost, the trust and responsibility Adam describes feeling on fight night once the cage door closes, and closes on the constrain-to-afford versus constrain-to-potentiate distinction Ian and Keith have been developing with Constraints Collective members this year — including where Adam thinks it holds up (striking) and where it doesn't (grappling, where seeing and doing are too tightly coupled to separate).

This is Part Two of Two — Part One (aliveness, safety by design, the calf kick) is available now from October's Week One Guest Podcast.

Read the companion blog: Do the Thing

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.

The Only Thing We Know Is What We Test — Adam Singer on Aliveness, Safety by Design, and What the Calf Kick Proves About Perception

This month's guest podcast: Ian Renshaw is joined by Marco Perazzo, filling in for Keith Davids, to talk with Adam Singer, who has coached mixed martial arts for close to thirty years at SBG Athens (Georgia, USA) and works by day as a biomechanical engineer. Adam's practice runs on a rule borrowed from mentor Matt Thornton: training is either alive, or it isn't — the moment a coach asks a student to modify their resistance, the exercise has become something other than sparring.

The conversation moves through why Adam constrains the training room rather than the person to keep sparring safe, the 1990 Julio Cesar Chavez vs. Meldrick Taylor fight that shaped his position on head contact, why the calf kick still lands on experienced fighters after a decade of everyone seeing it coming, why he doesn't lean heavily on opponent film, and closes on the lack of a shared, written criteria behind Brazilian Jiu-Jitsu belt rankings.

This is Part One of Two — Part Two continues in October's Week Two Podcast, covering Adam's actual session design principles and the constrain-to-afford versus constrain-to-potentiate discussion running through the Constraints Collective this year."

Read the companion blog: The Only Thing We Know Is What We Test

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.The Only Thing We Know Is What We Test — Adam Singer on Aliveness, Safety by Design, and What the Calf Kick Proves About Perception

This month, Ian Renshaw and Keith Davids chatted about why sport keeps falling for the same trick: something happens to be nearby when a team wins, and within a season everyone else is copying it. Ian's anchor image is Clive Woodward's six-foot pink furry dice, the story he tells in his own presentations about the England rugby team's 2003 World Cup win and how people can be vulnerable to fads and fancies when they copy and paste without any critical analysis. From there the conversation runs through officiating, with Ian arguing (against the popular mood) that referees are getting more decisions right over time, not fewer, and that slowed-down video footage is "just a rendering" that can mislead coaches into reductionist analysis.

The middle of the episode is the sharpest: marginal gains, non-linear systems, and a series of Guardian articles including an interview with Claire-Marie Roberts on pseudoscience creeping into elite sport, all converging on the same warning about short-term hacks in a sport awash with money. Keith introduces the idea of a "motif," a phrase that sounds like an explanation but avoids one, tested against two live examples: muscle memory and a nation's footballing "DNA," which Ian and Keith argue is really just a development system (Spain's, shaped by the University of Lisbon's complexity-science tradition, being a good example). They close on cricket, using Barry Richards's 1970s Gillette Cup footage to make the case for adaptability across eras and against early specialisation: you're a cricketer, footballer, rugby, hockey player first, before anyone decides your specialism.

---

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).

This month's guest podcast: Ian Renshaw is joined by Jay Carter, Golf New Zealand's National Team Coach and host of the *Talking Performance* podcast (197 episodes and counting), for a conversation built around a clip Jay sent after listening to TCC's Güllich episode. Jay's own 2024 interview with Ryan Fox — republished this August after Fox won The Open Championship at Royal Birkdale — became the case study: a New Zealand sporting-royalty kid (father Grant Fox, All Black goal-kicker; grandfather Merv Wallace, Black Cap) who made First XI cricket and First XV rugby at King's College alongside Tim Southee, and didn't get serious about golf until university.

The conversation moves through why "smash it" beat "be accurate" in Fox's early sporting intentions, the golf course used as an after-school playground before the game's popularity boom priced that out, why practicing to "feel better" isn't the same as practicing to get better, the transactional trap in paid coaching (and what it would take to actually get fired for being honest), boredom as a genuinely useful training constraint, and a caddying story from the Kazuma Kobori bunker at Royal Queensland that turns into a case study in broadening a player's affordances rather than narrowing them to "the right shot."

---

**Read the companion blog:** [Foxy's Long Way Round](https://www.theconstraintscollective.com)

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.

This month's guest podcast: Ian Renshaw is joined by Jay Carter, Golf New Zealand's National Team Coach and host of the Talking Performance podcast (197 episodes and counting), for a conversation built around a clip Jay sent after listening to TCC's Güllich episode. Jay's own 2024 interview with Ryan Fox — republished this August after Fox won The Open Championship at Royal Birkdale — became the case study: a New Zealand sporting-royalty kid (father Grant Fox, All Black goal-kicker; grandfather Merv Wallace, Black Cap) who made First XI cricket and First XV rugby at King's College alongside Tim Southee, and didn't get serious about golf until university.

The conversation moves through why "smash it" beat "be accurate" in Fox's early sporting intentions, the golf course used as an after-school playground before the game's popularity boom priced that out, why practicing to "feel better" isn't the same as practicing to get better, the transactional trap in paid coaching (and what it would take to actually get fired for being honest), boredom as a genuinely useful training constraint, and a caddying story from the Kazuma Kobori bunker at Royal Queensland that turns into a case study in broadening a player's affordances rather than narrowing them to "the right shot."

Read the companion blog: Foxy's Long Way Round

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.

This month's theory paper review: Ian and Keith dig into Woods, Richard, Martin & Cairney (2026), "Loosening Tightened Logics: A Comment on the Role of Affordances," published in New Ideas in Psychology, 83, 101289 — a paper that never mentions sport, and covers park benches, glass building facades, and a Brisbane street corner that turned itself into a shared garden without anyone designing it that way.

The idea at the centre of it: every training environment sits somewhere on a tight–loose dial. Tight space prescribes its own use — a cone drill, a single technical model, a serve that must land in a taped box. Loose space supports activity that unfolds in ways nobody specified in advance — an adaptable small-sided game with no one correct solution. Most environments drift tight without anyone deciding it should happen, and the paper argues almost nobody notices until it's named. Ian and Keith trace the theory back to Gibson's concept of affordance, work through the paper's case study of a university building facade that became a free dance studio purely because of what its surfaces afforded, and land on the practical takeaway: a coach's job isn't to fill the room, it's to decide, session by session, how much of it to leave open.

Companion blog: "The Bee Hotel Nobody Designed" · membership/community links to theconstraintscollective.com · Patreon support link.

This month's guest podcast: Ian Renshaw and Keith Davids are joined by Craig Harrison, who spent almost ten years running the long-term athlete development programme at AUT Millennium in Auckland and has just written a book, *Coach by Design*, about what he learned. Craig's central distinction splits environment design into two separate levers — structure (what the space lets a learner choose and perceive) and control (the force a coach applies to direct decisions on top of that) — rather than a single dial between drilled and unstructured training.

The conversation moves through the skate park as the clearest picture of designing for "everyday risk," the Maori concept of Tuakana Taina and cross-age mentoring, the "coffee club" Craig ran to help parents make sense of a more exploratory-looking programme, and the "Bambi effect" — the temporary loss of coordination that comes with a fast growth spurt, and why it calls for more structure and control rather than less. Late in the conversation, Ian connects Craig's framework directly to this month's theory paper review of Woods, Richard, Martin & Cairney (2026) on tightened and loosened space — the same underlying question, worked at two very different scales.

---

**Read the companion blog:** [Nobody Talks About Failure at the Skate Park](https://www.theconstraintscollective.com)

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).

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.

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.

# 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).