What about pulling back muscles and chest muscles?

Muscle strain is an injury caused by sharp contraction or excessive stretching of muscles during exercise. It is easy to happen when practicing long legs, pull-ups and sit-ups. After muscle strain, there is a sharp pain in the injured part. You can touch the strip lump formed by muscle tension with your hand, which is obviously painful, local swelling or subcutaneous bleeding, and the activity is obviously limited. After muscle strain, cold treatment should be carried out immediately-rinse the area with cold water or apply ice with a towel. Then properly wrap the injured part with a bandage to prevent swelling. While relaxing the muscles of the injured part and raising the injured limb, you can take some drugs to relieve pain and stop bleeding. After 24 to 48 hours, remove the bandage. According to the injury, you can apply a plaster for promoting blood circulation and reducing swelling, or you can apply a proper hot compress or massage the injured part in a lighter way.

I wish the patient a speedy recovery.