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If you're wondering what the right exercise ball for your height is, check out these guidelines brought to you courtesy of the editors at Fitness Magazine.
As a general guideline, anyone under 5 feet 10 inches tall should choose a 55-centimeter ball; those over 5 feet 10 inches should use a 65-centimeter model.
Your thighs should be parallel to the floor when you're sitting on the ball. If you're in between sizes, you can cheat a little by over-or under-inflating it, experts say. Keep in mind that an under-inflated model is easier to use and stabilize because more of its surface is in contact with the floor.