2. Sit in a chair with your fingers completely crossed behind your back, and then palms outward. At the same time, keep your hands straight and extend as far back as possible. At this time, your shoulders should stretch back naturally. Hold on for 30 seconds, this action can relieve shoulder fatigue.
3. Sit in a chair, hold the back of the chair with both hands to the right, and keep your feet on the ground. At this time, your waist will naturally stretch to the right. Similarly, when you hold the chair back to the left, your waist will naturally stretch to the left. Stick to each side for 30 seconds. This action can relieve waist fatigue.
The above exercises are for reference only, and it is not clear whether they are effective or not.
I have done a weight-loss exercise, that is, sitting on the edge of a chair (the chair should have a backrest), lifting my legs like pedaling a bicycle, and doing it 50 times a day in the morning and afternoon. Although very tired, you can thin your legs and see the effect.