If you are not familiar with Dynaflex, then you might want to checking it out. I believe that they are best known for their Gyro Exerciser, and I'm going to do my best attempt to describe what these transparent balls do. The Gyro Exerciser have a rotor inside that you can spin with the help of some string that it comes with. Seriously, you wind up the string, yank it, … [Read more...] about Diamond Powerball from Dynaflex