I can tell you that the stretch marks one year after delivery are caused by the rapid expansion and contraction of the skin during pregnancy. Although exercise can't completely eliminate stretch marks, it can help reduce the occurrence of stretch marks and improve skin elasticity.

Here are some exercises you can try:

1. Aerobic exercise: Aerobic exercise, such as brisk walking, jogging, swimming or cycling, can promote blood circulation, increase the nutritional supply of the skin and help reduce the appearance of stretch marks.

2. Abdominal exercise: Abdominal muscle exercises such as sit-ups and flat support can enhance the tightness of abdominal muscles and reduce the relaxation of abdominal skin.

3. Yoga: Some postures in yoga can help strengthen the core muscles, improve the flexibility and balance of the body, and thus improve the elasticity of the skin.

4. Massage: Regular body massage can promote blood circulation and increase skin elasticity and softness. Special massage oil or lotion can be used to help massage effect.

In addition, it is also important to maintain proper diet and drinking water. Adequate intake of vitamins C, E and Zn is helpful for skin repair and regeneration.

It should be noted that everyone's physical condition and reaction are different, so it is best to consult a doctor before starting any new exercise plan. They can give more personalized advice and guidance according to your specific situation.