Hand Exercise Balls for Stress Relief, Rehab, and Balanced Grip Endurance Training. 

Benefit From Active Rest: When it comes to improving your grip, few tools are as effective as the IronMind EGG. This is a simple, compact hand exercise ball that fits
Overview: The Gaiam Restore Hand Therapy Exercise Balls Kit quickly became one of my favorite tools for both recovery and grip training. I first tried it