I finally did this one today for the first time (I am really late to the Cross Train Express party), but I do have many Cathe lower body workouts, and am always amazed that all are so challenging in different ways. I find the floor work in Butts and Guts very difficult (especially those evil side leg lifts on the ball), but this one challenged my endurance with the recovery calf raises. Turbo Barre is hard, Legs and Glutes is hard, Great Glutes is hard, Pyramid Legs...all in their own way. X Train Legs, RWH Legs, Lean Legs and Abs aren't quite as hard, but still work my legs hard. I can't pick between them and very happy to cycle between them.