Pitching a baseball is an incredibly violent use of the wrist, elbow, shoulder, back, oblique and legs
I would invite you to get a few baseballs and at about 25 second intervals throw it as hard as you can to a cooperative receiver
About every other pitch twist your wrist to create some break
Report back after about 50 pitches though most of you reading this will have your arm in a sling for next 24+ hours