The way to exercise the lower limbs with a stretcher is to pull the left arm in the direction of the right shoulder and hip, and then vice versa. The action is shown in the figure below.

Stretcher is a kind of equipment suitable for mass fitness. The advantage of using a stretcher is that biceps brachii is a muscle with two muscle heads, and its main function is to bend the arm. Another muscle, the triceps brachii, is also used when bending the arm. However, only when doing some forearm lifting exercises, such as bending the high-position puller or anti-high-position puller toys, can the brachial muscles be fully exercised. In addition, the flexor brachialis, the main muscle of the upper forearm, also plays a lot of roles in arm flexion, which can be strengthened by lateral bending of the tensioner.