This guy is a true superman. Not just for his upper body strength, but for his fingers. It is so easy to pop a ring tendon (or two), when your entire weight is hanging off two fingers (1:42). This guy has just immensely toned fingers. And he uses no tape! (Almost all climbers have tape for previous injuries or as a preventive or just as a superstition.)
And I’ve never any human being do a one-handed dyno move before (2:57).
I had a door-frame chin-up bar a long time ago, but it didn’t permanently attach. It was fairly proof against falling down because your weight levered against the top outside edge of the frame, but it just didn’t give me much height and tended to warp the wood in the frame over time.
About fifteen years ago I bought one of these and I absolutely love it. It requires more room to use, but it can be collapsed for storage. That said, I just leave it standing in my office. It’s extremely sturdy and safely stable, but I do recommend the stabilizer cross-bar to minimize the slight wobble purely for comfort’s sake.