I thought the wheelbarrow race was where each person had a partner, one partern got down on the ground in the position as though he were going to do a push up, and then his partner takes his ankles and with his feet thus held, and his hands on the ground, the contestant teams race across a certain distance. Then the partners switch places and everyone races back.
I've played this once - it was fun.
EDIT: Groin, add Javan to the sack-fight.