1. Push-up stretching: Lie on the ground, put your hands on the ground, then push your body up, while stretching your arms back for a few seconds, and then slowly lower your body.

2. supine leg stretching: lie on the ground, straighten one leg, bend the other leg, and then lift the straightened leg up until you feel a slight stretch in your back.

3. Sit up straight: Sit in a chair, straighten your back, and then slowly lean forward until you feel a slight stretch in your back.

4. Stand forward and bend: stand with your feet together, then stretch your arms up, as close as possible to your legs, hold for a few seconds, and then slowly relax.

5. Yoga cat-and-cow style: land on all fours, put your hands and knees under your shoulders, then arch your back up, head down, and relax after a few seconds.