quote:
Originally posted by TPM:
You don't need to have a strong arm to throw a 5oz ball.
Velocity is produced way before the pitching arm moves, upon landing he's simply transferring energy produced from the forward momentum (and all the stuff that goes with it). The arm just goes along for the ride, if the pitcher has to exert more force from the arm, he's not using his body correctly to produce that energy and will eventually have an injury, regardless of how "strong" his arm is.
I just don't see how you don't get this GBM.
The arm is not just "along for the ride" though. It also helps create the needed velocity to throw hard. I agree that there is a transfer of energy from the legs on upwards in a kinetic chain. But to just say that the arm plays no role "strength" wise is not true. Like i said before, arm strength does two things- it helps prevent injury by having enough muscle to protect what would otherwise be fragile ligaments and joints, and also adds to the velocity of a baseball by imparting the final flick of the wrist.
Let's say for instance that Joel Zumaya was to use my sons arm to throw- sons arm on Zumaya's frame. What do you think would happen? First off, he would probably break his arm or severly tear something inside. Second, he wouldn't have the same velocity- not nearly as high. This is because of the lack of general arm strength.
I am not suggesting that a pitcher gets most or even close to all of his velocity from just his arm. I know that a pitcher gets most of his velocity in the kinetic chain of events in the entire windup. I am suggesting that a small percentage of a balls velocity is created directly from the arms ability to withstand the force generated by the torso rotation and then the flick the wrist to give it it's final push.
That's all.
I recently went to a camp that had "professionals" there and they did a drill with all of the pitchers on developing a more forceful wrist flick. The pitching coach even said that not only will this drill help impart a tighter rotation on the ball creating greater movement, but that the extra force generated by the flick will improve the overall velocity. Guess what? The drill involved nothing other than the arm- no legs, no torso or any other part of the body.
As far as the flick of the wrist goes, it takes 100% arm strength to do that- no other muscle in the body is responsible for the flick of the wrist.