CrossFit is a branded fitness regimen created by Greg Glassman and Lauren Jenai in 2000. It is a registered trademark of CrossFit, Inc., which was founded by Glassman and Jenai in 2000. CrossFit 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. CrossFit, Inc. licenses the CrossFit name to gyms for an annual fee and certifies trainers.