Fat Gripz are the new worldwide training phenomenon which helps add muscle and strength to your upper body (especially your biceps and forearms)
Fat Gripz work by instantly converting barbells, dumbbells and pull-up bars into thick bars so that you can train the way many Pro athletes do. Using a thicker diameter bar causes much greater muscle Activation throughout the arms
Made from a high-density material a lot like extra tough rubber - they are built to last a Lifetime and won't compress even if lifting extreme loads