Upgrade Version: - Dual spring design - More durable & comfortable material - Widening & lengthening foot pedals sizes - Fixed sturdy foot pedal interior design - Perfect for professionals and the man who need intensive training *Exercise abdominal muscles The body sits on the yoga mat, the legs are flat, the feet are placed in the fixed foot pedals, and the handles are held back by the hands with the strength of the waist, three groups at a time, 20 in each group. *Exercise arm muscles The body sits on the yoga mat, the legs are flat, the feet are placed in the fixed foot pedals, and the handles are held back by both hands with the strength of the arm, three groups at a time, 20 in each group. *Exercise your arms and chest muscles The body sits on a yoga mat, legs are bent, feet are placed in a fixed foot pedal, and the handle is held by both hands with the strength of the arm, three sets at a time, 20 in each group.