Each pedal also has a nonslip surface for added comfort and safety. Anti-scuff rubber feet will never scratch the floor, it can be used both on floor for leg exercise and on desk for arm exercise. ✅ Adjustable resistance for customize exercise, easy to adjust the intension by rotating the knob, pedal is very easy, it is perfect for rehabilitation following a surgery or injury, also great for elderly to do exercise for their legs and arms.