The community that spontaneously arises when people do these workouts together is a key component of why CrossFit is so effective. Harnessing the natural camaraderie, competition and fun of sport or game yields an intensity that cannot be matched by other means. 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.