1. Hold the wrist tightly in front of each other, and pay attention to the elbow joint outward, and pull the left and right elbows together. After determining the stress on the chest muscle, the same as 1. But if excessive exertion leads to fatigue, it will be counterproductive.
2. Press two parts of the chest with both hands and squeeze toward the middle. The muscles on both sides of the chest should also be tightened. Generally, repeating 10 times or so is enough.
3. Straighten back muscles and correct potential. Make a fist with your palm, and the inside of your elbow is close to your body. It is best not to leave your wrist, open your shoulders, keep tense for 2~3 seconds, and then relax your chest muscles and back muscles. And it is repeated 10 times in the state of chest.
Matters needing attention
When you sleep, don't always be in the same position. It's best not to sleep on your stomach. You can wear a bra at night.