Long before the Steelers strolled on to the Heinz Field lawn Saturday night to play the Kansas City Chiefs in their only exhibition game that means anything, quarterback Ben Roethlisberger was warming up by throwing passes in the runway outside the locker room. A passerby on his way to the field tapped him on the shoulder and offered a word of advice. "Stay healthy out there, will ya?" Roethlisberger grinned. "That's the plan."