This could not be truer for a baseball player. Power, bat speed, throwing distance, speed and velocity of a fast ball or the bottom dropping out on your breaking stuff are all significantly tied to forearm and wrist strength development.

Development of the lower arms, including wrist, grip strength and the strengthening of all the tendons and ligaments that tie everything together are solely dependent on the development of muscles that make up the forearms and wrist flexors.
 

The E-Flex Forearm Bar is a revolutionary Patented free-weight forearm / wrist strength isolation bar designed specifically with the ball player in mind.  The unique leverage mechanics and ergonomics incorporated into this apparatus allow you to build powerful forearms and super strong wrist flexors.
 

The E-Flex Forearm Bar is also designed with a pitching / throwing specific motion exercise that will build and strengthen the extensor muscles and tendons that are responsible for elbow and wrist rotation.  This will improve, speed, velocity and movement to those specific aspects of your throwing game.

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source: http://www.baseballwriststrength.com/