Oh sorry that was on another thread I think that would be the 4th round if I remember. Beleive me its not easy, youre under a lot of strain, its pulling you everywhere. That kid is really fit, the one you want to try is the 2 fit balls looks easy how he does it but, Its working every muscle in the body at the same time. I doubt if anybody on the forum could do it. It puts imense pressure on the shoulders and abdominals and lower back. plus youre stablizing the ball with your inductor muscles, try it youll be shocked.