2, stretching exercise: straighten your arms and lift up, and then slowly and forcefully stretch to the back of your head. The upper body can bend back a little, bend as much as possible, and then put your arms on your sides. Inhale when the arm is raised, exhale when it is retracted and put down, and do it 50 times repeatedly.
3. Walking: Take a walk outdoors every morning, and learn to inhale slowly and then exhale quickly. Expand your chest when inhaling, and then exhale quickly.