I have tried indoor rock climbing a few times and it, excuse the pun, rocks. I've also often wished I could have a 'wall' in my backyard. Theoretically now I could, that is if I had the $10,000 to buy my own Treadwall. The Treadwall is like a vertical treadmill with built-in, adjustable grips that you use to climb the wall. What a great piece of exercise equipment for all ages!
With the Treadwall, you set your pace and angle of accent according to your own climbing speed and fitness level. It is safer than actual wall or rock climbing because you are never more than a couple of feet off the ground. There is even a version of the Treadwall designed so it can conveniently be transported on a trailer, one for outdoor use, and with optional wheels it can easily be moved around to suit.
I really hope I find a Treadwall in my yard some day!