CrossFit maintains that proficiency is required in each of 10 fitness domains: cardiovascular/respiratory endurance, stamina, strength, flexibility, power, speed, agility, balance, coordination, and accuracy.[1] CrossFit says it increases work capacity and speed in these domains by provoking neurologic and hormonal adaptations across all metabolic pathways. The program's weightlifting component includes complex, compound movements with heavy loads. CrossFit also uses kettlebells, gymnastics rings, pull-up bars and many calisthenics exercises. CrossFit may call on athletes to run, row, climb ropes, jump up on boxes, flip giant tires, and carry odd objects. They can also bounce medicine balls against the floor or a target on a wall.
CrossFit workouts typically call for athletes to work hard and fast, often with no rest. Many CrossFit gyms use scoring and ranking systems, transforming workouts into sport. Many CrossFit athletes and trainers see themselves as part of a contrarian insurgent movement that questions conventional fitness wisdom.[2][3]
CrossFit adaptations include programs tailored for children, seniors, military special forces candidates, triathletes and martial artists. Most CrossFit gyms also offer "Boot Camp" or "Elements of CrossFit" introductory classes for beginners.