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Exercise balls come in various sizes. Basically, your thighs should be parallel to the floor when you sit on your exercise ball. The best way to choose is to follow the manufacturer's guidelines based on your height. Models are available for almost anyone. Heavier individuals can get one size larger as it flattens out a bit. The balls are strong and some support up to 600 pounds. Kits are available with the ball, stands, tubing, videos, or other accessories.