DS has ADHD and has just popped his dad's yoga ball by bouncing on it... (He was so sorry, bless him.) He could have really hurt himself. So I'll replace the yoga ball for DH, but I'd like to get DS an alternative all-body-fidget-toy so we don't have a repeat of this incident! Can anyone recommend anything please? Preferably for indoor use. (Swingball is doing well outside so far). DS is big (tall and solid) for his age (11yo) and very enthusiastic / vigorous... Thank you for any ideas!