Meet the WalkSlide: a hybrid exercise machine that serves as a treadmill, cross-trainer, and nordic-ski trainer. It features two mini-treadmills mounted on springs and does not require any electricity to work. It also does not make a whole lot of noise. It lets you get a good workout while watching your TV. The angle of incline is fully reversible, so you can try downhill or uphill training. You can find the device on Kickstarter.
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