I've found that balance boards (on top of a tube) require too much concentration to balance. Instead I used a skateboard deck on a cushion[0] at my standing des

I've found that balance boards (on top of a tube) require too much concentration to balance. Instead I used a skateboard deck on a cushion[0] at my standing desk. You can adjust difficulty by adjusting the inflation of the cushion. [0]: http://indoboard.com/cushion http://indoboard.com/cushion