Originally Posted by toly
I disagree with this statement.
Let’s assume we rotate torso around the spine with fixed passive straight arm. Since the arm is connected to the shoulder, it inevitably begins to move and therefore it gains kinetic energy. Thus, some segments of the body can add energy to other ones. But, I think this is obvious and you certainly understand that.
As I understood Albesca, it's not just arithmetic sum, but there's a progression in how parts align and interact to create optimal conditions for fastest racquet acceleration at the point of impact.
I would also argue, that even if PROPER coordination/rotation of lower/upper body contributes only 15% to the racquet speed, LACK THEREOF might cause a 40% slow down.