CrossFit describes its strength and conditioning program as “constantly varied, high intensity, functional movement,"[3] with the stated goal of improving fitness (and therefore general physical preparedness), which it defines as "work capacity across broad time and modal domains."[4] Workouts are typically short—20 minutes or less—and intense, demanding all-out physical exertion. They combine movements such as sprinting, rowing, jumping rope, climbing rope, weightlifting, and carrying odd objects; they use barbells, dumbbells, gymnastics rings, pull-up bars, kettlebells, medicine balls, and many bodyweight exercises.[5][6][7] These elements are mixed in numerous combinations to form prescribed "Workouts of the Day" or "WODs". Hour-long classes at affiliated gyms, or "boxes," typically include a warm-up, a skill development segment, the high-intensity WOD, and a period of individual or group stretching. Performance on each WOD is often scored and/or ranked to encourage competition and to track individual progress. Some affiliates offer additional classes, such as Olympic weightlifting, which are not centered around a WOD.[8]
CrossFit programming is used by 4,400 private affiliated gyms[9] and many fire departments, law enforcement agencies, and military organizations including the Canadian Forces and the Royal Danish Life Guards,[10][11][12][13][14] as well as by some U.S. and Canadian high school physical education teachers, high school and college sports teams, and the Miami Marlins.[15][16][17] In addition, there are a number of gyms that use CrossFit-style exercises and workouts but are not officially affiliated with CrossFit, Inc. Many people who do CrossFit workouts on their own often post their results on CrossFit's website.
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