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.
These large, broad muscles -- which help create the characteristic V-shaped back of a bodybuilder -- are responsible for pulling your arms down and back, which is the action you use during the lat pulldown exercise. Lat pulldowns also work other muscles on your back, shoulders and arms.at pulldowns also work the rhomboid muscles on your upper back, which draw your shoulder blades toward your spine, as well as the lower trapezius muscles, which pull your shoulder blades down. The exercise strengthens the rear deltoids on the backs of your shoulders, which help pull the arms backward.