Action essentials of chest pushing in sitting position:
1. Sit on the chest pusher and choose the appropriate weight. Keep your back close to the back of the chair, step on the ground with your feet, hold the handles
    with both hands, and keep your palms down. Open your elbows to both sides of your body, point your forearms forward, and then straighten your arms forward.
    This is the starting position of the action.
2. Bend your arms slowly, put your hands back and inhale at the same time. Pay attention to control strength when returning, until the chest stretches to the limit.
3. Then straighten your arms quickly, push your hands forward and exhale at the same time.
4. The above is a complete action. Repeat the action as many times as recommended.