COMMISSIONED OFFICER. Commissioned Officers are the managers, problem solvers, key influencers and planners who lead Enlisted Soldiers in all situations. Enlisted Soldiers perform specific job functions and have the knowledge that ensures the success of their unit's current mission within the Army.
The primary difference between chin-ups and pull-ups is that chin-ups are done with a supinated grip, palms facing in toward the exerciser. This sets up the mechanics so that chin-ups, while still primarily a back exercise, also provide a good arm workout, particularly for the biceps.
The pushup chiefly targets the chest, shoulders and triceps, the muscles on the back of the upper arm. In the chest area, pushups work the pectoralis major, the thick, slab-like muscles that span from the collarbone to the upper ribcage. As the shoulders drive the motion of raising and lowering your body, the pushup focuses on the main muscle of this body part, the deltoids.