With Special Reporting by Matt Gagne, Joan Niesen and Lizzy Pierce
When Mike Martin wakes up in his house north of Cincinnati, he first takes off the mask that pumps oxygen to ward off sleep apnea. He swings his feet to the floor and stretches them, then stands. Martin feels stiff on his walk to the bathroom. His left Achilles, surgically repaired in 1988, causes him to limp slightly; since the operation his left calf is smaller than his right. His right hip, replaced last January, shortly after he turned 50, takes a while to loosen up and feel right, so he favors his right side too on the short walk.