CrossFit is a branded fitness regimen created by Greg Glassman. It is a registered trademark of CrossFit, Inc., which was founded by Glassman and Lauren Jenai in 2000. Glassman obtained complete control over the company after a divorce with Jenai. It is promoted as both a physical exercise philosophy and a competitive fitness sport, incorporating elements from high-intensity interval training, Olympic weightlifting, plyometrics, powerlifting, gymnastics, girevoy sport, calisthenics, strongman, and other exercises. It is practiced by members of thousands of affiliated gyms, roughly half of which are located in the United States, and by individuals who complete daily workouts.
CrossFit programming is decentralized, but its general methodology is used by thousands of private affiliated gyms, fire departments, law-enforcement agencies, and military organizations, including the Royal Danish Life Guards, as well as by some U.S. and Canadian high-school physical-education teachers, high-school and college sports teams, and the Miami Marlins.