That's a relative question. Harder compared to the weight and rep's used? Or harder because of the motion of the exercise? And we are speaking of BB Hacks, rather than machine Hacks, right? I would consider BB Hacks as reverse DL's. Bar behind, than in front, of the body. Going to work more total back (lat's, traps, etc) as well as the lower body. But you will focus more on legs and eliminate the shins & knees getting in the way, than the regular DL. BB Hacks over squats for a more total body workout. BB Hacks are my favorite exercise. Anyone can work up to some pretty impressive weight with this exercise. Good luck.