The hardest exercises and workouts are the ones that involve stressing and testing fascial fitness. The fascial tissue throughout the body works as a single organ. Its strength aids directly in translating muscle strength to explosive power and Ruffian is the kind of workout that helps you become better on that score. It's a full body Level IV workout that will get you into the sweatzone from the very first set and then keep you there.
Extra Credit: Keep the plank between push-ups and tricep extensions, don't drop down on the floor.