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Squeeze the gripper as hard as possible.
An overcrush involves crushing the gripper handles together as hard as possible for several seconds, resulting in an isometric in the fully closed gripper position. Similar to a strap hold, this exercise is performed on a gripper one has dominance over and focuses on developing strength for the final bit of the gripper close.
Overcrush
Watch the Video - Gripper Overcrush (WMV)
