Health & Fitness: Off The Scales and into the Tub

What counts today is not what you weigh, but how much is fat

When Don Simpson checked into Tucson's Canyon Ranch Spa last year, he figured he needed to knock off a dozen pounds. The co-producer of Flashdance, Top Gun and Beverly Hills Cop knew he "had a tendency to gain weight" after each movie. Still, the string of megahits had only managed to push the scale up to 199 lbs., not too far out of line, he thought, with the standardized chart readings for a 5-ft. 9-in. 40-year-old male. But Simpson got a rude shock when the spa analysis revealed what proportion of his weight was muscle and what fat. A puffy 31%...