The moment you use your body in ways other than it is naturally designed to be used your calorie burn goes up because inefficiencies occur in how power is transferred to, and used by, the muscles. This, however, also allows us to train our bodies in ways that increase the power of the muscles themselves and the power output of muscle groups that cooperatively work together. The Crawler helps you do all of that. Add EC, it really needs to be as hard for you as possible.
Extra Credit: 1 minute rest between sets.