⚾ TRY THIS NEXT TIME YOU TRAIN Quick anatomy lesson. Many of the muscles responsible for wrist flexion, extension originate near the elbow and travel through the forearm to the wrist and hand. The muscles responsible for pronation and supination also play a major role in controlling the forearm during throwing. Why does that matter for baseball players? Because every pitch and throw requires the forearm, wrist, and hand to rapidly produce, transfer, and control force. That’s why grip and forearm