Which muscles are located on the front of the chest and assist with lateral arm movement?

The pectoral muscles, commonly referred to as the "pecs," are located on the front of the chest and play a significant role in lateral arm movement. Specifically, they are involved in actions such as arm flexion, adduction (bringing the arms towards the body), and rotation. When engaging in exercises like push-ups or bench presses, the pectorals provide strength and stability, allowing for effective movement of the arms across the body.

The other muscle groups mentioned have different functions. The abdominals are primarily responsible for core stability and trunk flexion, not arm movement. The deltoids, while involved in arm movement, are located around the shoulder and are mainly responsible for raising the arm. The trapezius muscles are situated in the upper back and neck area, involved in movements of the shoulder blades and neck rather than directly assisting with arm movement from the front of the chest. Thus, the pectorals are uniquely positioned and functionally relevant to lateral arm movements, making them the correct answer.