CrossFit is a strength and conditioning program. It combines weightlifting, sprinting, and gymnastics. CrossFit states that proficiency is required in each of ten fitness domains: cardiovascular/respiratory endurance, stamina, strength, flexibility, power, speed, agility, balance, coordination, and accuracy. CrossFit defines fitness as increased work capacity across all these domains and it achieves this by provoking neurologic and hormonal adaptations across all metabolic pathways. CrossFit athletes run, row, jump rope, climb rope and carry odd objects. They frequently move large loads quickly over short distances, use powerlifting and Olympic weightlifting techniques. CrossFit athletes also use dumbbells, gymnastics rings, pull-up bars, kettlebells, and many bodyweight exercises. CrossFit is used in over 10,000 gyms worldwide and by many fire departments, law enforcement agencies, and military organizations.