Slate writers on the business, culture, and science of working out.

"Gym Rats and Dope Fiends: Exercise can help reduce drug cravings. But is exercise itself a kind of drug?" by Daniel Engber. Posted Friday, Jan. 21, 2011.

"Now, Hold That Squat. And Smile!: The strange life of the fitness model," by Josh Levin. Posted Friday, Jan. 21, 2011.

"Kafka's Calisthenics: Watch and learn the favorite exercise routine of early 20^th century Europeans," by Sarah Wildman. Posted Friday, Jan. 21, 2011.

"How the Soloflex Changed America: The story of a pilot, a shirtless spokesmodel, and a transformational home-fitness device," by Justin Peters. Posted Thursday, Jan. 20, 2011.

"Work Out So Hard You Vomit: The rise of P90X, CrossFit, and the 'extreme' exercise routine," by Annie Lowrey. Posted Thursday, Jan. 20, 2011.

"Cheeks of Steel: Are face exercises a scam or a fountain of youth?" by Elizabeth Weingarten. Posted Thursday, Jan. 20, 2011.

"Sweatin' With the Fatties: My endless, fruitless quest for a fat-girl-friendly exercise DVD," by Torrie Bosch. Posted Thursday, Jan. 20, 2011.

"Celebs (and Others) Working Out: A collection of Magnum photographs." Posted Wednesday, Jan. 19, 2011.

"10 Tips for Tighter Buns!: The fitness magazine: where it came from and where it's going," by Troy Patterson. Posted Wednesday, Jan. 19, 2011.

"Fitness for Foreigners: How people exercise in China, Pakistan, Sudan, and Sweden." Posted Wednesday, Jan. 19, 2011.