The versatile eTrainer Upper & Lower Body Passive Assist Trainer is a low-impact Auto Exercise Bike designed to strengthen the upper body and lower body simultaneously or independently. Smooth operation of the adjustable hand crank and foot pedals help strengthen muscles in the wrist, upper arms, shoulders, ankles, thighs and calves. Users can enjoy the benefits of a healthy exercise program without jarring impact and uncomfortable strain on joints. The Active and Passive Assist Trainer boasts all the features of the passive trainer with the added benefit of two resistance levels as well as U-shaped handles and convenient casters for transport.