Jim Karn (Elite Climber)

Climbers typically have overdeveloped flexor muscles and underdeveloped extensors. The Handmaster Plus hand strengthening device is the only product I have ever seen that effectively balances the muscles of the hand, wrist and forearm to rehabilitate or prevent these injuries. The Handmaster Plus is an essential tool for serious climbers.”
-Jim Karn, Multiple U.S. National Climbing Champion