A stability ball is the correct size if

a. your thighs are parallel to the ground when you sit on it.
b. your hips are lower than your knees when you sit on it.
c. your fingertips touch the top of the ball when you stand next to it with your arms relaxed at your sides.
d. it depresses less than 2 inches when you sit on it.
e. none of the answers are correct


a. your thighs are parallel to the ground when you sit on it.

Health & Biomechanics

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