Originally Posted by boramiNYC
OP, yes internal hip rotation that occurs between femur and pelvis is very important in being able to use the core effectively. Too many rec players' muscles around pelvis (below and above) are ineffective (shortened and/or weak and stiff from non-use) very few can effectively use their core (hip and abs) in their strokes and for moving around the court. Anybody who improves control and effectiveness of this area would benefit hugely in their game. It's not only important in FH but in everything including simply walking and running. It's the key for great balance capability compared to average balance. I believe every single pro has this area very well controlled. It's like a requirement for a great athlete even tho they might not know in detail how things work in there.
when i hit at 60%, i can hold my left side back
when i start swinging at 100%, my posture starts to breakdown. i think the addition force requires more internal hip flexibility which i dont have.