Hey, anyone have experience with the Door Gym (see http://www.karatedepot.com/tr-ex-25.html ). Looks like a non-marring way to get a chinup bar, but I hadn't heard of it until I read something in a book. We rent, so this would be great if it actually works (and doesn't dump you on your butt). Of course I'd have to work up to actually being able to do chinups then
Door Gym (i.e. chinup bar)
Of course I'd have to work up to actually being able to do chinups then 
