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The strength of our hand grip is such a reliable measure of upper body strength that it is often used as a measure of overall muscular strength. What is less known perhaps is that a better hand grip strength has been found to be associated with cardiac functions and structures that help reduce the risk of cardiovascular incidents. In addition research indicates that grip strength in midlife can predict physical disability in senior years. All of which mean that you’d better ace this challenge and reap some really long term rewards for it. 

Instructions: Clench and unclench your fists as fast and as hard as you can, non-stop, for a given time for each day. Keep up with the animation for maximum results. Clench your fists, tense your arms and hold them over your head to do a flex hold.

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