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 it's supposed to do: Train chest and shoulders. What it actually does: It can put the shoulder in an unstable position and place excessive stress on the shoulder joint and its connective tissue. A better exercise: Incline Push-Ups. Aim for 15 to 20 reps.