You ladies are in so much better shape than I! Last night, after warming up and stretching before spinning class, I used one of our smaller balls at the club for planks - and this time I tried moving the ball around with my forearms and found that much more challenging. Just using the ball for a regular plank is easy, this was not - evil, evil, and so good for me.

Thanks for starting this thread - I suspect that this has put some ideas into Nat's head (my trainer) for new variations for building upper body strength. I had him check my form on the ball to make certain I was doing it correctly. I am currently in a new building phase in my training sessions - until May when I will drop to once a week maintenance mode for the season.