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The quadriceps is muscle group consisting of four muscles that flex the knee, which is a major movement of the farmerâs walk. These muscles are the rectus femoris, vastus intermedius, vastus lateralis, and vastus intermedius.
Walking lunges engage the quadriceps muscles during the pushing off, or concentric, contraction, allowing you to return to a stand. They quads are composed of the vastus lateralis, vastus medialis and rectus femoris. During walking lunges, the vastus medialis and lateralis both act on the knee, stabilizing it and preventing it from injury during the push. Rectus femoris is the largest of the quad muscles and is responsible for most of the strength.