Gym Ball

Hi everyone! :)

Please forgive any typos - I am on my phone which can be a real pain at times!!

Anyway I recently bought some "work out kit" including a tummy trainer (i know how to use that one!-) and also a pilates swt which came with two 2lb toning balls, a power bamd and a gym ball.
The gym ball is what I want to ask about. Iv never used one before, and apart from using it to do sit ups I have no idea I should use it.

Please help!

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