The Upper Body is defined as any muscle above the waist: Chest, Back, Shoulders, Forearms, Biceps, Triceps, etc.
Chest (Pectoral)- The chest muscles main purpose is the act of pushing. Think of pushing a heavy object! Strong Chest muscles help with everyday activities such as: throwing a ball, balancing posture, pushing heavy objects, etc.
Back (Trapezius and Latissimus Dorsi)- the outline of your body. The "support frame" to your muscles. The back is responsible for movement related to the torso, arms, legs, neck. To work your Latissimus Dorsi pull-ups (any pulling movement) is good. To work your Trapeziums any pushing upward movement works.
Shoulder (Deltoid)- Shoulder muscles are responsible for pushing directly upward. Think of reaching for an object overhead. Shoulder muscles are used constantly from activities like throwing a ball to brushing teeth.
Biceps- The bicep muscle is responsible for the action of curling. When picking up a heavy object and bringing it to you, your biceps are activated. Biceps work in relation with Triceps (when one is working the other is relaxed and vise versa).
Triceps- The tricep muscle is responsible for straight arm movements. Triceps work in relation with Biceps (when one is working the other is relaxed and vise versa). Triceps allow a lot of arm mobility: work with push-ups and pull-ups.
Forearms- The forearm muscles are responsible for grip strength. You are constantly using your forearm muscles in life like using a pencil. Strong forearm muscles improve grip strength.
The Upper Body is made up of many muscles. The more strong the muscles are, the better your coordination, ability to play sports, and posture. A strong Upper body is a strong factor in preventing injuries and illness. The Upper Body works together as one unit to accomplish daily tasks!