fitball, exercise ball - whatever those are called:

http://www.ausphysio.com/library/ima...ll%20photo.jpg
I heard a lot of good things about these, been kneeling and standing on them at the gym so I bought one and have been sitting on it for 3.5 hours and can't feel the fatigue or recruiting of the core muscles as everybody is talking about.
what's the hype about ?

http://www.ausphysio.com/library/ima...ll%20photo.jpg
I heard a lot of good things about these, been kneeling and standing on them at the gym so I bought one and have been sitting on it for 3.5 hours and can't feel the fatigue or recruiting of the core muscles as everybody is talking about.
what's the hype about ?






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