The Grip Strengthener is a highly portable piece of equipment that can help target the flexor-pronator muscle group. It can help build strength around the area and also improve grip strength vital to batters as well. The compact design allows you to fit it in your pocket, or gym bag, making it easy to take anywhere.
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Grip Strengthener 10-100Kg Adjustable Hand Grip Strengthener Exerciser Wrist
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Podcast #72: Talking Grip Strength and UCL Protection with the Flex Pro Grip • RPP Baseball
UCL Protection Package (w/ programming) • RPP Baseball Store
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allow athletes to work on their hip hinge, lower body stability, core and many other exercises specific to baseball.
Sliders
RPP Mesh Grips
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Strength Training - RPP Revolution
The Club Bell has been around for ages and can be used to effectively coach deceleration through pronation as well as helping strengthen the flexor
Club Bell Pronator
The Wrist and Forearm Trainer is a strengthening tool that strengthens the flexor carpi radialis, a relatively thin muscle that assists in abduction
Wrist and Forearm Trainer