Force-Velocity Profiling, Strength for HYROX & The Enhanced Games | ENDUROX Podcast Ep. 3

Join Dr. Dan Plews, Dr. Adam Storey, and guest Sam Purchase in Episode 3 of The ENDUROX Podcast. In this episode, they break down force-velocity profiling — what it is, how to measure it without a lab, and how to use it to identify and fix the exact qualities holding back your HYROX performance. They also recap the Enhanced Games and why the whole thing was a bit of a flop.

They cover:

  • Sam Purchase: S&C coach, PhD researcher at AUT, and founder of Chase Health and Performance
  • The Enhanced Games: why performances underwhelmed, whether the doping protocols actually worked, and the swimsuit confound
  • Force and velocity: what the force-velocity profile actually measures and why it matters for power output
  • The difference between the molecular force-velocity relationship and compound movement profiling
  • Force dominant vs velocity dominant: what it looks like, what it means, and how to identify which you are
  • Applying the profile to HYROX: which stations cluster together and why
  • Sam's master's research with professional rugby players: forwards vs backs and what the data showed
  • How Pierre Samozino's 2008 methodology made FV profiling accessible with a tape measure and a phone
  • Sam's PhD research: three novel movements — bench pull, overhead press, and hip thrust — and why they matter
  • The propulsive phase explained: what it is and how to measure it
  • Training prescription from the profile: how to structure force or velocity blocks for a HYROX athlete
  • Contrast training and post-activation potentiation: the mechanism, the application, and where it fits
  • Why max strength still matters for HYROX, and why the "it doesn't matter" narrative is wrong
  • How to periodise the FV profile into a full race build
  • Sam's PhD data collection: how to get your profile tested at AUT Millennium

Timestamps:

00:13 - Introducing Sam Purchase: coaching background and Chase Health and Performance

04:16 - Chase Health and Performance opens in Grafton, Auckland this July

07:49 - The Enhanced Games: media appearances and first impressions

09:16 - Why the doping didn't work: past their prime, bad products, or already doped fields?

13:30 - The swimsuit problem: a confounding variable on top of a confounding variable

14:43 - Would a longer protocol change things at the 2027 Games?

16:02 - The complacency factor: does being enhanced change how hard you train?

17:20 - Why Dan is relieved the Enhanced Games flopped

17:51 - Force-velocity profiling: what it is and why it matters for HYROX

20:34 - The cycling erg analogy: same power, different force-velocity mix

21:02 - Molecular FV relationship vs compound movement profile: an important distinction

25:16 - Applying the FV profile to HYROX stations and triple extension movements

26:40 - What the theoretical HYROX force-velocity curve actually represents

28:27 - Sam's master's research: load spectrum testing with a professional rugby squad

31:22 - Forwards vs backs: what the data showed

31:56 - Endurance vs strength athletes: what you'd expect from their profiles

33:47 - Training prescription: why you train the opposite of your dominant quality

34:13 - Why endurance athletes are often more force dominant than expected

35:24 - Movement specificity: why a jump squat profile doesn't transfer to isolated muscles

36:57 - Dan's experience: why his legs adapted faster than his upper body post-Ironman

38:27 - When does FV profiling become useful vs just getting stronger?

40:04 - Samozino 2008: three variables, a tape measure, and no lab required

41:28 - The propulsive phase explained

44:01 - HYROX relevance: how the three PhD movements map to race stations

46:03 - Practical prescription: loading Bulgarians for force vs velocity dominant athletes

48:07 - Contrast training vs French contrast: what the difference actually is

48:18 - Post-activation potentiation: the mechanism behind contrast training

51:51 - Reps in reserve and why contrast work isn't a true strength stimulus

52:28 - Why strength is being sidelined in HYROX coaching and why that's wrong

54:14 - Strength and VO2 max as the two most important qualities for HYROX

54:36 - Dan's pushback: strength endurance and why efficiency is the missing piece

56:11 - Programming the FV profile into a full race build

58:20 - Hunter McIntyre as the "up and to the right" benchmark

59:01 - How often to reassess: why two loads are enough

1:00:02 - Sam's PhD data collection: get tested at AUT Millennium in Auckland

1:02:20 - Closing: individualization is the point