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.
What Muscles Do Pull-Ups and Chin-Ups Work. 1  During a Pull-Up the muscles that are mainly worked are those of the upper body and the arms. 2  It is one the largest muscles found on your body, on the lateral sides of the back. It is responsible for supplying much of the force needed to execute a Pull-up.