Bill Hartman 44:14–45:54
Well, you need to maintain ER within a certain range. So this is you training someone and getting to know them and you say, I need to have this much of this and this much of this. So I have had the benefit of actually doing an assessment on a world record holder in the four by four. He was on the four by 14. And if you measure his hip internal rotation, based on this discussion, you'd say, oh, he probably has a lot of internal rotation. He has almost none, okay? At the hip, where they get it is it's associated with their orientation to create the force into the ground. So again, they don't have time to demonstrate a lot of internal rotation at the hip. So if they had a lot of internal rotation at the hip, they would actually be dampening the force because again they extended the time that interrotation occurs so they want very little interrotation at the hip and they use they orient the axial skeleton so it points downward that's where interrotation occurs and so again we're talking about performance here we're not talking about We're not talking about health. We're not talking about relative motion. We're talking about high levels of performance. And so again, this is why we have to look at intro meditation differently. Everybody wants to look at it as joint excursion. And I'm talking about it. It's a down force. It is forced into the ground. It's like, how do I produce that to the best of my ability? I orient as much as I can into that position. And then I limit the excursion because again, I want that timeframe to be infinitesimally small, because the longer I'm on the ground, the slower I am.
external rotation (ER)internal rotation (IR)sprint mechanicsforce productionperformance optimization