This has a practical sporting application for anyone needing to absorb force and generate power from their legs and project it through their upper body, especially in a pushing motion like a lineman in football. Put one person on either side of a large tire with a staggered stance. One person will keep their elbows tucked, drive with their legs, and shove the tire towards the other person. The other person will tuck their arms close to the side of their body and absorb the energy with their core and legs muscles, then redirect the tire back to their partner.
