So you want to throw hard?!

Baseball pitch velocity has become a big topic of discussion these days, with the number of pitcher able to reach or exceed the 100mph mark increasing and the average pitch velocity now creeping into the 90's (where it had been high 80's).

Pitch velocity is a product of arm speed.  Arm speed is a result of the coordination of elbow extension and shoulder internal rotation velocity.  When coordination is optimal, shoulder internal rotation speeds can reach anywhere from 6000 deg/sec to upwards of 8000 deg/sec at ball release.