Give you some simple methods, but you need to stick to them.
Thoracic:
Prepare two bottles of mineral water with the same weight, hold the mineral water in your hand and make it level with your shoulders, and expand your chest. This should work! It's simple, and then go up. Do 30 movements three times a day. Can ensure that the chest does not sag.
Do push-ups with your hands against the wall every day before going to bed. Do it 30 times at a time This is for the next one.
Wipe your chest with body lotion before going to bed every day. The method of rubbing is to open the jaws of both hands, taking the left chest as an example. The left hand pushes in from under the armpit and the right hand pushes up from under the chest. Do the same for your right chest. Push your right hand inward and put your left hand on the net. This will not only prevent sagging, but also help you keep your chest full, because it will stimulate the fat in your chest to heat up and expand. Even if it does not increase, it can maintain the fullness of the chest. Massage for 15 minutes before going to bed every night. Five minutes for the left chest and five minutes for the right chest. You can also count directly to 300. Then after massaging both sides, the right hand strokes from the left chest under the armpit to the middle of the chest, and the left hand also massages the right chest, 50 times per chest. Then hold the left chest with your right hand and knead it clockwise for 50 times, and so does your left hand.