CrossFit, is a fitness regimen developed by Greg Glassman over several decades by long term studies. Glassman, the founder and CEO of CrossFit, defined the fitness as an increased work capacity across broad time and modal domains. He then created a program specifically designed to improve fitness and health.

CrossFit is constantly varied functional movements performed at high intensity. All CrossFit workouts are based on functional movements, and these movements reflect the best aspects of gymnastics, weightlifting, running, rowing and more. These are the core movements of life. They move the largest loads the longest distances, so they are ideal for maximizing the amount of work done in the shortest time. The training intensity is very important for quick results and this can be measured by work by time. According to the CrossFit approach, functional movements and intensity lead to dramatic gains in fitness level of a person.