The first action: move the two shoulders backwards, usually for about half a minute, then shrug your shoulders for half a minute, repeat the above action three times in total, the specific duration of each time varies from person to person, you can train the rhomboid, front serratus and trapezius muscles. The second action: you can often do wall push-ups, generally about 5 minutes each time, a total of three times, the specific duration of each time varies from person to person. Training of the serratus anterior, rhomboids, etc. The third method: If you take the bus can use your hands to grab the car on the ring, and then slowly lean forward, and then back, repeat three times, the specific duration of each time varies from person to person.