I am dripping in sweat. My pink activewear is at least two shades darker, the salt is stinging my eyes, and my butt is burning. I’m at Tracy Anderson’s inaugural London studio, and there are two ...

One day around 2015, a dozen or so gift boxes showed up at the Brentwood, California, studio of the celebrity fitness trainer Tracy Anderson. The boxes were from the fashion designer Stella McCartney.

Each day, thousands of women, myself included, engage in a ritual. We flail our arms like orchestra conductors. We wiggle our rib cages. We get down on all fours and raise our knees to our ears. We ...

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