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It flexes your knees and allows flexing and movement of your hips. If you pick your foot up and look at the sole of your foot then you are using all the functions of the sartorius muscle.
When cycling forward in a straight line, the knee joint flexes and extends, rather than rotating about an axis. The rotation occurs at the hip joint, allowing the leg to move in a circular motion as the pedal is pushed downward.
When punching someone, you do many types of movements. When punching, you usually extend the arm and forearm and flex fingers.. Now there are over 50 muscles in relation to the upper limbs but we will go over the basics. Since it will take a while to understand the anatomy, I'll give you a brief list of the muscles. This includes the arm and forearm. Triceps (extension of the arm) Anconeous (extension of the arm) Flexor digitorum longus and superficialis (flexes joints of the fingers)