Abdominal crunch action:
1. Choose a moderate weight, if unsure, consult a trainer
2. The head and torso are always close to the seat cushion, hold the handles on both sides of the head with both hands, and do abdominal flexion training. The movement speed is fast when sitting up, and the speed should be slowed down when falling back. Exhale as you fall.
3. According to your coach’s command of training times and groups.
