Chet Alexander can deduce how much force a gymnast needs to keep her grip during a common move on the uneven parallel bars .
Chet Alexander is a professor in Alabama 's department of physics and astronomy who regularly attends UA gymnastics meets .
Chet Alexander , a professor in Alabama 's department of physics and astronomy who regularly attends UA gymnastics meets , can deduce how much force a gymnast needs to keep her grip during a common move on the uneven parallel bars .