i want to buy an exercise ball and i am not sure which one to buy.?

55 cm, 65cm, or 75 cm
I am 16 years old and not sure which one to use.
my weight is 164lbs.


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    One Response to “i want to buy an exercise ball and i am not sure which one to buy.?”

    • Laser B:

      If you lay on it , your knees shouldn’t touch the ground, while your head is in the ground.

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