I found a fitball on clearence at Walmart the other day and bought it on a whim. I like the idea of excercising with it, only problem is I'm not sure what to do with it?? Pathetic huh?? Also I
accidentally purchased and oblong one (40") and now I am thinking i should have gotten the other I think it was 26" round.

Does anyone do this, can anyone recommend sites etc... for excercises and does the shape of the ball make a big difference?