The "upper body" refers to the part of the human body that includes the chest, back, shoulders, arms, and neck. It plays a crucial role in various activities such as lifting, pushing, and pulling. The upper body is essential for many daily tasks and physical exercises, contributing to overall strength and mobility. Key components of the upper body include major muscle groups like the pectorals, deltoids, and trapezius. These muscles work together to support movement and stability. Additionally, the upper body houses vital organs, including the heart and lungs, which are protected by the rib cage.