Gavin MacMillan spent years building athletes nobody expected to make it — boxers, hockey players, tennis pros. Then Aryna Sabalenka hired him, and the tennis world started paying attention.
In this episode, Gavin breaks down the serve transformation that took Sabalenka from 6 double faults in a single final to 6 double faults across an entire tournament. He explains why 99% of strength coaches in tennis are operating on the wrong principles — and why bigger, faster, stronger is the biggest lie in the sport.
He's now working with Coco Gauff. And he has thoughts.
🎾 WHAT WE COVER IN THIS EPISODE
→ Why conventional weight training is actively hurting tennis players
→ The Federer "toothpick" principle: how elasticity beats muscle
→ Sabalenka's serve rebuild — the real story, step by step
→ What Gavin is working on with Coco Gauff right now
→ Why you can't think your way through a serve under pressure
→ The coaching lie: "I played it, so I can teach it"
→ The broken ATP/WTA system — and why nobody's fixing it
→ Caro Garcia on what she'd change about her career if she started over
→ Why tennis is the single hardest sport in the world to succeed in professionally
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⏱ CHAPTERS
01:00 Gavin's background — 7 sports, hockey, losing his mom at 15
02:00 Narcissistic tennis parents & the crystal ball problem
03:30 Why tennis is the hardest sport in the world to succeed in professionally
06:00 Tennis vs the fight business — the only comparable mental challenge
07:30 Inside boxing: weight cuts, Cotto vs Canelo, and the A-side
10:30 Why conventional weight training is destroying tennis players
12:00 Force vs power — the Soviet training science nobody in tennis is using
13:00 Federer's toothpick body vs Nadal — the real difference explained
15:00 The door analogy — why bigger muscles increase injury risk
18:00 Why there's almost no science in tennis coaching
20:00 Gavin's live analysis of Caro Garcia's game
22:00 Caro's shoulder injury & the 22,000 serves per year problem
25:00 The insane tennis calendar — no other professional sport does this
28:00 Instagram fitness coaches on tour & the science nobody uses
29:00 Technical flaws in the modern game — you cannot hide them anymore
32:00 Federer's on-the-run forehand & why Sampras would dominate today
35:00 The skills gap — why top players still can't execute the basics
37:00 Gavin joins Coco Gauff's team — his exact role
39:00 How long does it really take to change technique on a pro player?
42:00 Coco's serve numbers — the before and after
44:00 The Sabalenka serve transformation — the full story
47:00 The reps math — why "5-minute serve fixes" are for functional morons
48:00 What Freddie Roach taught Gavin about great coaching
51:00 One thing in the corner — simplicity under extreme pressure
56:00 The 70% first serve rule that made Sabalenka unbeatable
1:00:00 Advice to young players: what actually builds a career
1:01:00 The 85% rule — why going 100% loses Grand Slams
1:07:00 Women's tennis marketing — why the tour is failing its own players
1:11:00 Identity, mental health & living and dying with every point
1:18:00 The camera on Sabalenka after a loss — the tour's exploitation problem
1:22:00 Federer's parents — what Gavin learned meeting them at the Australian Open
1:24:00 Coco Gauff at 21 — changing her serve the week before the US Open
1:29:00 Caro: "I would have had a better team" — what she'd change about her career
1:31:00 Every athlete falls to their level of preparation — not one rises above it
1:34:00 George St-Pierre, stars aligning, and the luck factor in elite sport
1:37:00 The unlicensed conditioning industry — and why it's getting players hurt
1:40:00 Injury prevention: the right evaluation every player should have but doesn't
1:42:00 The serve biomechanics breakdown — why Rafter's motion damaged him and Federer's didn't
🎾 TENNIS INSIDER CLUB
The inside story of professional tennis — hosted by Caroline Garcia (former World No. 4, 2022 WTA Finals Champion)
Hosted on Acast. See acast.com/privacy for more information.
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