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The four huge muscles are namely rectus femoris , vastus lateral , vastus intermedius and vastus medialis. Commonly called as the calf muscles. The calves are located in the lower back part of your legs. They are key muscles when you lift your heels up, such as when you walk, run, and go upstairs.
Major Muscles on the Front of the Body. Sometimes the name of the muscle includes it’s function—such as extensor, flexor, adductor, abductor. The muscles on the front of the trunk help lift the arms and move the body forward and sideways. They also protect the organs in the abdomen.