One thing to cautious of is using dumbbells while lying on the ball. Francisco Garcia of the Sacramento Kings was doing exactly that a couple of weeks ago, and the exercise ball burst, sending him crashing to the floor with a 90 lb dumbbell in each hand. As a result, he ended up with a broken wrist and torn ligaments. Be careful out there!
http://healthyweightwatch.com/balance-ball-for-weight-loss/comment-page-1/#comment-11470
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