Kerry,
If you should get the chance perhaps you can answer the following.. Pitching is my son's primary position (h.s. freshmen) and he likes to work out with a heavy bag (boxing). I'm am afraid (although not certain) such may be counter-productive for a baseball player, particularly a pitcher.
Your comments would be greatly appreciated.
"On two legs, Mickey Mantle would have been the greatest ballplayer who ever lived." - Nellie Fox