Chiropractors love plywood. It's good for business when someone attempts to tote a 4x8-foot sheet single-handedly. Save your back by using a carrier. Tie the ends of a 20-foot rope, creating a loop. Slip the loop around the two bottom corners, reach over and grab the center sections of the rope on either side of the plywood, and lift the board into your underarm. No sweat, no backache.