We've seen some pretty extreme pull-ups from the likes of Hannibal, the Barstarzz Community, and others, but never with the Rogue Dog Bone. It'd be interesting to see what they can do with it. You can tell how hard it's going to be by just looking at it. The Dog Bone has two surfaces you can work with. The three-inch bar section is still a killer for many of us but if you want a real challenge, grip the five-inch spherical ends and pull-up. They're not just for pull-ups though. You can use the Dog Bone for tricep press downs, rows, kettlebell farmers walks, lat pull downs, and more.