Here are some ways to develop yours. Swing a bat.
Ballplayers swing a bat as often as possible during the winter months as well as during the season.
This willl increase arm strength as well as perfect your swinging technique. Work off a batting tee. It can be used indoors with tennis and plastic balls or outdoors with baseballs. Squeeze a rubber ball or use wrist grips to develop finger and wrist strength. Perform rollups and rolldowns.