The Skill Board

I really like this balance board. Most other balance boards I've seen are a flat board on top of a foam roller. This one works with a ball instead of a cylinder so you get 360 degrees of balance. It makes it much harder to learn, but also much more useful for real world applications. The progressions mechanism works really well. To make it more or less challenging you simply use the supplied pump to inflate or deflate the ball (flatter ball = easier).