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.
Care must be taken to avoid cramping the muscles in the hand. A support grip typically involves holding something, such as the handle of a bucket, for a long time. This type of strength is epitomized by the  Farmer's walk , where the bucket is filled with sand or water, and carried over a long distance.