Not a treadmill, but a treadwall?

If the treadmill has gotten too boring for you, maybe you should consider trying the treadwall instead. Nope, that's not a typo -- it's basically a vertical treadmill with grips and steps on it to make a climbing wall that moves with you. It's adjustable for speed, and since you're never more than a couple feet off the floor there's no need for fancy harnesses or a second person right there to catch you.

Not as convenient as some equipment for your home (doesn't look like it will slide under the bed) but I think it looks awesome for the gym -- and it made the Forbes list of next generation gym gear so it must be cool.