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02-25-2008, 05:54 PM
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Join Date: Dec 2002
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Originally Posted by PruBlue25 View Post
I can't sit on the thing for more than 30 minutes and then my back starts to hurt, so point taken. Although I can see how doing exercises as simple as curls could have an added function with the ball.
Don't confuse sharp spinal pain with simply muscle fatigue. If you aren't used to using your stabilizer muscles (as the poster above pointed out) they tire awfully fast and your back will hurt. Same phenomenon is noted when you go roller blading or ice skating for the first time in a long time.

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