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The quadriceps femoris (four-headed muscle of the femur, quadriceps, quadriceps extensor, quads) is the great extensor muscle of the knee, forming a large fleshy mass which covers the front and sides of the femur. It is the strongest and leanest muscle in the human body. With being a large muscle group that includes the four prevailing muscles on the front of the thigh - these muscles are crucial in walking, running, jumping and squatting.
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