1, the pectoral muscles have been fully trained, fully stimulated and completely congested (generally, the pectoral muscles will be sore from the second day to the fourth day).

2. Due to lack of strength, inadequate movements and other reasons, the strength is scattered and the body is tired, but the chest has not been fully exercised (the lack of strength is mostly three heads, and the borrowing is mostly shoulder muscles).

I feel that you belong to the second kind. Although the action looks right, you haven't really found the feeling of chest muscle strength. I suggest starting with push-ups. Don't underestimate push-ups. Even fitness friends rarely really do it. Do the standard!