Fitleader FS1 Indoor Stationary Exercise Bike Smooth magnetic resistance: Provide you with variable resistance and offer you a proper, gym-style exercise bike Comfortable performance seat: Full motion adjustable seat support cyclists of all levels and body types. Near-silent durable drive: Strong and built-to-last design, gives the rides a quite and fluid ride. Flywheel: You supply energy to overcome the resistance, and turn the wheelthe energy comes from the movement of your muscles, and thats what helps you burn calories. Transportation wheels: Enable effortless transportation when you finish your exercise at home