Nothing's perfect . I agree that some move are not for interval work. As a certified trainer , I sometimes question the order of the routines. I do crossfit and draw the limit at over head squats and snatches. I substitute snatches with squat cleans. It still stands as the best group training because it works. And I've seen very few injuries and none serious. I've seen more injuries in my ice hockey league and flag football league than crossfit. Crossfit is a sport in concept . My question is why do you see more girls than guys at crossfit ?