WW, would you post the Bregman drill (video) you are referring to?Think of it as staying closed and anchored against the forward momentum. That’s the explosion. That’s the stability, the balance, the whip. In order for there to be an explosion the legs have gotta stay stable so reactive/reciprocal rotation can take place.
the pelvis opening is a stretch reflex. If you do the JStone PVC drill ‘Walking away from your hands’ correctly, you will feel the pelvis SR. If you keep the bottom half of the leg stable you will feel the middle pull. It’s not so much about the opening. It’s about the stable backside pulling the ‘opening’ torso backwards, propelling the top half forward. I would take the forward rotation out of the description. Imo it’s all reactive rotation, from the pelvis to the front leg to the torso and shoulders..
look at the back leg RESIST rotation. That’s the start and finish of the swing. That gives the body an opportunity to separate forward and backward.
it shows up in many different ways. Eversion, scissor, foot re-anchoring immediately , back foot going up in the air and behind, space being maintained between the feet. Many ways. The Bregman drill is great for feel.
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