Helps rebalance muscles and provides a full-body workout. The smaller base of support and dual pedals allow for bilateral, unilateral and reciprocal variations of leg and arm exercises that challenge core stability. Seated, prone, supine and partially supported standing exercises provide a wide array of functional training opportunities. Works well for rebalancing muscles weakened due to strain or injury. Two pedals move independently or lock together to form one. Sturdy handles offer solid support for upright exercise. The seat is 23.5"W x 15"L. Overall 22.5"W x 21.5"L x 55.5"H, weighs 82 lbs. Bundle includes Stability Chair with Handles, Padded Platform Extender, Reformer Box with Footstrap and two DVDs: Essential & Intermediate Stability Chair , 2nd Edition and Split-Pedal Stability Chair.