Even a strong version of DPM recognizes constraints -- do elite sprinters have a larger portion of fast-twitch muscles? Probably. Replace height with muscle composition and there's nothing that falsifies those who advocate DPM. (and I don't believe the DPM idea myself)

This is a fantastic article and I am reading it from top to bottom, so it's possible my question is addressed further down. However, I am wondering if you explored other ways of measuring relative improvement after age 19. It seems like "percent improvement" is not ideal, since clearly there can't be 100% improvement and a 10% improvement is much much better than a 5% improvement. Although, it's t...

Shalom, I have read your article: "You can’t teach speed: sprinters falsify the deliberate practice model of expertise". At study 1, you write that: "All 15 Olympic champion sprinters were recognized as being exceptionally fast relative to their peers before or coincident with their initiation of formal training. There was no indication in any biography that any sprinter was initially unexceptio...