Deltoids : The deltoids, also known as the shoulders contribute to both the front and back of the upper body. They are essential to building a strong upper body. Chest: The chest muscle is a major muscle in the upper body also. A well-developed chest is very important because it will add major size to your inner upper body.
Chest: The chest muscle is a major muscle in the upper body also. A well-developed chest is very important because it will add major size to your inner upper body.
The upper body comprises seven general muscle regions in the shoulders, chest and back. Each of these regions contains several muscle groups consisting of several muscle heads, or parts.