Most chest muscle training programs start with flat bench press, but when you want to strengthen the training of specific parts, you should give priority to training when your strength and energy are relatively strong. In other words, if you want to strengthen the training of the lower chest, then the first thing you have to do is to train the movements of the lower chest, such as the barbell bench press.

If you usually arrange the lower chest for the last training, once you arrange it for the first training, you will immediately find a significant increase in the lower chest. So it can be concluded that if you want to strengthen a certain part, you must first train. Once you put it in the first training sequence, don't worry about choosing a heavier load and fewer times than usual. If you usually use 10 times for each group, you can now increase the weight and then do it 6-8 times for each group. Don't underestimate that this training program can stimulate muscles more effectively.

The anterior part of the superficial thoracic muscle, also called the descending thoracic muscle, runs down from the sternal stalk to the humeral crest, and this equine muscle can be clearly seen on the chest surface. The posterior part, also called transverse pectoral muscle, extends outward from the sternum to the inner surface of the arm, and cattle and Kyle extend to the forearm. The superficial thoracic muscle can adducte the forelimbs. Pectoralis major originates from the ventral surface of the sternum, adjacent costal cartilage and the front of the abdominal bottom wall.

References:

Baidu chest muscle encyclopedia