Review on 50cm Diameter SPRI Balance Trainer Sport - Dome Shape Half-Exercise Ball with Non-Skid Base for Effective Balance Training, Strength Building, Toning, and Enhanced Flexibility by Josh Hamler

I need to make a lot of adjustments for my knees that have been injured from years of kickboxing. The kickboxing paid off. To do a lot of freelifting, I really need a surface to stand on so my knees don't turn into little round bones from the pain. It helps me practice balance and form. Because this is something I've been taught through years of Pilates, but it's the first thing I should do when I'm lazy or tired. This balance ball helps a lot. It's really strong.