Caroline Knapp

I walk into a health club locker room and feel an immediate impulse toward scrutiny, the kneejerk measuring of self against other: 'That one has great thighs, this one's gained weight, who's thin, who's fat, how do I compare?'

For many years, I struggled with how I felt about myself. I hid and harbored very self-destructive eating issues, namely anorexia, which at its worst caused me to lose half of my hair and brought my weight down dramatically.

The toughest trail I ever ran was the Escarpment in the Catskills of New York State. This was an 18-mile race through Rip Van Winkle country, routed through boulder fields, across angular juttings of granite and along a path with an unrelenting barrage of roots, rocks and mud, all of it hidden under slick leaves and dangling nettles.