The chest muscles, primarily known as the pectoralis major and pectoralis minor, are located at the front of the upper body. The pectoralis major is a large, fan-shaped muscle that helps in movements like pushing and lifting. It is responsible for actions such as bringing the arms together and lifting them upward. The pectoralis minor is a smaller muscle situated beneath the pectoralis major. It plays a role in stabilizing the shoulder blade and assisting in arm movements. Together, these muscles contribute to upper body strength and are often targeted in exercises like push-ups and bench presses.