Posted by: SteveT () on Wed Aug 9 17:03:32 2000

I think the posts in this thread are missing Jack's point. The keywords are "other than their contribution to shoulder rotation." He isn't saying the lower half isn't contributing, quite the contrary.

"However, I have to believe that if my body, "from the armpits down" were somehow encased in concrete, I would generate significantly less bat speed."

Absolutely. Because the lower half could not influence shoulder rotation. This would be true regardless of what energy-transfer theory you subscribe to. I have to assume you really meant from the waist down, since encasing it at the armpits would also stop torso rotation.