The boutique fitness phenomenon sold exclusivity with a smile, until a toxic atmosphere and a push for growth brought the whole thing down.

On learning to jog.

A world in which an internal software turns anger and intense emotions into involuntary exercise.

"Then there are the monthly upgrades, downloaded automatically from GRUNT. A few months back the upgrade reprogrammed our sensors to monitor facial expressions and the tone of one’s voice, so you can’t fool it anymore by smiling or speaking softly. A quiet argument is still an argument to the executives at GRUNT. It certainly changed around Brad, my supervisor, who liked to hint at our utter worthlessness in this very quiet voice, a smile stretching across his face. There was something disturbing about watching him grin, and place his arm gently over your shoulder and lower his voice as his called your work garbage, your very existence a nuisance, all with this soft, earnest voice. Now he wears track shoes to work and does sprints in between insults, weaving in and out of the cubicles, stutter stepping like a hall of fame running back."

On the casting process for New York’s cult leader-like spin instructors.