The pectoralis major and pectoralis minor are the two main muscles that make up the pecs, located in the chest area. The pectoralis major is a large, fan-shaped muscle that helps with arm movements, such as pushing and lifting. The pectoralis minor is smaller and lies beneath the major, assisting in stabilizing the shoulder. Pec muscles are important for various physical activities, including sports and weightlifting. Strengthening these muscles can improve upper body strength and enhance overall athletic performance. Exercises like push-ups and bench presses are commonly used to target the pecs effectively.