Re:I built my own... (Score 2, Interesting)

Like you, I built something similar (though without the wall-mounted shelf).

I don't do this at work, but the concept of playing video games on a treadmill is one that I've also personally put into practice, and it seems to work pretty well for me. I've lost about 50 pounds since I started, though of course, I've also altered diet significantly at the same time. Everyone's mileage varies, of course. Try it, don't try it, what do I care?

My set up is a treadmill with a shelf over the handlebars, similar to the pictures seen several comments up. I've got several straps that hold my laptop to the shelf, and then I've got a wireless mouse. I play World of Warcraft, so I'm not generally needing twitch-sensitive decision making, and I've found that I can't really do instances (as a healer) while walking - too much concentration required. However, I can grind quite easily, fish, gather herbs, farm, etc - I set the treadmill to about 2.7 mph, walk for an hour, and I've done my exercise. I find the time flies - I don't notice the walking, and I don't notice the exercise either. I can keep up with chatting - typing while walking isn't that hard once you practice it, and WoW chat can hardly be described as error-free in any case.

I'd echo getting a good treadmill - cheap ones break - or get a good service plan. I've already worn out one walking platform.