The primary muscle group utilized during push-ups is the pectoralis major, or the chest muscles. However, push-ups also engage the triceps, which are located at the back of the arms, and the deltoids in the shoulders. Additionally, the core muscles, such as the abdominals and obliques, must stabilize the body during the movement. Thus, while the chest is the main target, push-ups provide a comprehensive workout that strengthens multiple upper body and core muscles.