The size of male pectoral muscles is divided into five grades, of which Grade A has almost no traces of exercise and looks like Ma Pingchuan; Class b has a certain fitness foundation, and the chest muscles begin to have obvious contours; Class c has 1~2 years of fitness experience, which is much better than classes a and b; Class d usually has a clear fitness plan, and almost no unarmed training is done, which is common for fitness enthusiasts who have trained for more than three years and fitness athletes with higher standards; Class e belongs to the bodybuilder level.

Male pectoral muscles can be enlarged through daily unremitting exercise.