The pectoralis major and pectoralis minor are the two main muscles that make up the pectoral muscles, 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 muscle, assisting in stabilizing the shoulder. Pectoral muscles play a crucial role in various physical activities, including sports and daily tasks. Strengthening these muscles can improve overall upper body strength and enhance performance in activities like swimming, weightlifting, and push-ups.