Those are your pektorals AKA peks it's easier to say.
That is the correct spelling of "pectoral" (muscle of the upper chest).
pectoral
That is part of the pectoralis major.
Pectoralis major
...be careful, it can start of pneumonia, chest infection, Amoxilin worked for me good.
An effective workout routine targets the upper body muscle groups including the chest, back, shoulders, and arms.
The thin sheet of muscle is called the diaphragm. It relaxes and contracts to help us inhale and exhale.
upper arm chest stomach calf butt
- Chest - Back - Abs - Upper Legs/quads - Lower Legs - Arms
The primary muscle groups targeted during a chest press exercise are the pectoral muscles (chest muscles), the deltoids (shoulder muscles), and the triceps (back of the upper arm muscles).
The muscle on the upper chest that adducts the arm is the pectoralis major. It is a large, fan-shaped muscle that helps to bring the arm closer to the body and is commonly worked during exercises like bench presses and push-ups.
Incline flyes target the upper chest more, while flat flyes work the middle chest. Incline flyes can help develop the upper chest more effectively, while flat flyes are better for overall chest development.