As used in the phrase null and void, refers to something that binds no one or is incapable of giving rise to any rights or duties under any circumstances.
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.
When walking, the calf muscles are responsible for the upward and forward momentum in the pushoff stage of walking, which raises the heel off the ground, HowStuffWorks explains. The tibialis anterior and ankle extensor muscles lift the foot and toes during the forward motion or swing phase of the leg.