Choosing the Right Size55cm is recommended for persons 5' to 5'5" tall65cm is recommended for persons 5'5" to 6'75cm is recommended for persons 6' and taller About GoFit GoFit, founded in 1999, offers a wide variety of innovative home fitness products which use educational content to increase their effectiveness. The DVDs feature wisdom and encouragement from an impressive collection of professional fitness and nutritional experts in the areas of core training, weight resistance, and yoga. GoFit products are available worldwide and in over 3,500 stores nationally.Commercial-grade exercise ball for core stabilitySuper-thick walls are weight-tested for durabilityWeight-rated up to 2000 lbs.Includes DVD, ball plugs, pump, and exercise posterSize options: 55 cm., 65 cm., or 75 cm.Manufacturer's warranty included (see product guarantee)