Asked several times to describe how he injured his back, Woods elaborated very little, except to say that it happened in the fitness trailer on Wednesday.

To keep his elbow loose, he visits a fitness trailer on site and does stretching exercises twice a day.

"It just seized up on me out there," said Irwin, who was treated for an hour in the fitness trailer.

He went immediately to the fitness trailer for treatment.

"I've been to the fitness trailer every night," she said.

Ask the physical therapists in the Tour's mobile fitness trailer for the identity of the workout king and Norman's is the first name mentioned.

The fitness trailer at tour stops has become almost as popular as the driving range, and more players are becoming passionate about working out.

The fitness trailer has become one of the favorite hangouts on the Tour, with more golfers taking better care of their bodies than ever before.

When I walk into the fitness trailer, they think I'm bringing lunch.

Five years ago the PGA Tour had no fitness trailer, just one for injury rehabilitation.