High-quality welding and materials prevent wobbling or shaking during vigorous pedaling. Suitable for all fitness levels. Fully Adjustable Indoor Exercise Bike: Stationary Bike provides 8-level comfortable padded seat cushion and 8-level adjustable handlebar to adapt to different users of different heights (4'8" to 6'5"), whether it is children, adults, or the elderly, it can be adapted to use, very suitable for family use.