Life Stretchers

BREATH-TAKING EXERCISE

Cheryl Tiegs made her mark posing in swimsuits before the camera. But these days the former supermodel is more likely to be found in a leotard and tights, in an environment in which the word pose takes on a new meaning. Tiegs, 51, along with a multitude of other celebrities, has discovered a magical fountain of youth in the deep breathing and graceful poses of yoga. For the past 18 months she has been attending three classes a week at Yogatopia in Brentwood, Calif.

Yoga was a challenge in the beginning, even for the famously fit Tiegs. "The first...