It used to be that country and rock musicians where almost expected to act badly while on tour. Think Johnny Cash, or a million others, hitting the bottle or pills, or 80s rockers trashing hotel rooms. But things have changed. The focus now is staying healthy, and stars from sports to music expect to keep working well into middle age and beyond. Country star Tim McGraw is a good, and good-looking, example. At 48 he’s left his drinking behind and now leads the workouts with his posse on the road.