first you said they are changing posture after foot down. hip hinge doesn’t changed at all. I showed you that. Not on good swings. The amount of other things may change at start. But the fact of the matter is posture doesn’t change. Why? Bc it’s a function of the swing. Like I said before. And TDS was trying to tell you. They establish their posture (Hip hinge) and don’t adjust it.
hip hinge loads the glutes and separates the upper and lower but most importantly engages the pelvis so one won’t shift laterally to the front leg too early. If one changes their posture ‘down’ after foot down that’s the equivalent of buckling on a curve or off speed. If you don’t establish it before foot down you will shift early. it’s not style or whatever. It matters a lot.
yes. One can change their posture in their set up. But not after stride.