DFX Sports & Fitness Deluxe Exerflex Fitness Ball with DVD - 50-65cm The DFX Sports & Fitness Deluxe Exerflex Fitness Ball with DVD comes with everything you need to get started: wall chart, pump, instructional DVD and the only adjustable exercise ball in the market today from 50-65 cm. Here are some of the benefits of the Exerflex Fitness Ball: simple to inflate and adjust, designed for lasting durability, holds up to 1000 lbs, and specifically targets buttocks, thighs, abdominals, and back...(more)