Backward pedaling is a kind of leg pushing exercise, which usually requires the use of a leg pedal or self-weight. In the backward push, the human body is in an inclined position and the legs are pushed forward. This action mainly exercises thigh muscles, especially quadriceps femoris. Retreat can enhance the strength and explosive force of quadriceps femoris, and also exercise the muscles of buttocks and calves.

Leg flexion and extension is the action of exercising thigh muscles through knee flexion and extension. When the sitting leg flexes and stretches, the human body is in a sitting position, and the feet are placed on the leg flexion and extension device, and the knee joint flexes and stretches. This action mainly exercises the biceps femoris in front of the thigh and the rectus femoris in the inner thigh. Leg flexion and extension in sitting posture can enhance the strength and endurance of thigh muscles and make the knee joint more stable.