EXERCISE BALLS aka swiss balls? cont'd?
*Is simply sitting on an exercise ball going to tone my abs? I work at an office for 8 hours 3 times a week and i was wondering if just sitting on an exercise ball all day would help me tone my abs. *What are core muscles?
I checked some out and there were 55cm ones and 65 cm ones and I'm not sure which one to get. *Does it depend on my height? I'm 5'7, 133 pounds if that matters.
I already do cardio for one hour everyday and i am on a healthy diet so please keep your answers precise; I added a star next to my Qs.
Thanks! =)
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