Back extension action:
1. Adjust the waist trainer and select the appropriate weight. 2. Sit down, put your upper back against the pad lever, grasp the armrest, and step on the footstool with both feet. Your head should be Look straight ahead and hold out your chest. This is the starting position of the action. 3. Straighten your hips and waist spine, straighten your body and start to move, and push the pad lever backward. 4. Pause for a while when the action reaches the highest point, and then restore to the starting position. 5. The above is a complete action. Repeat the action as many times as recommended.
