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 exercise targets the pectoralis major muscles and, more specifically, the muscles' sternal heads. People commonly refer to the pectorals as pecs or chest muscles, and the sternal heads make up the bulk of your chest.xecution of a push-up also requires the short head of your biceps brachii and erector spinae muscles. These muscles are found in the front of your upper arm and along your spine, respectively. During a push-up, your biceps are a dynamic stabilizer, while your erector spinae is an antagonist stabilizer.