The Chest Muscles
The human chest cosists of two muscles: Pectoralis Major, which is the bigger muscle and leads from the middle of the chest to the upper arm bone, and Pectoralis Minor, which is the smaller chest muscle and connects 3rd, 4th and 5th rib with the shoulder blade. The pectoralis major covers the pectoralis minor and is the big muscle bodybuilders want to focus on. It's quite common to say "Pecs" instead of pectoralis or chest muscles. Find exercises and information about other muscle groups at weight training main.