... metabolism Injury protection Improved self esteem Improved aerobic fitness New Twist and shape stepper 1. Steel tube thickness: 1.5mm and 2 ... at same time. Stair machine to work deep muscles without putting exreme pressure on bones and joints Effective aerobic exercise ... same time. Effective to the leg, abdomen, thigh and lower body. Electronic meter: Time, distance, count, total count, calories Size ...