Virtuix’s Omni whatchamacallit looks a little like a Star Trek transporter pad with a handrail. The rail sits up close, circling your abdomen like a belt, keeping you centered and upright as you move.

Short on space, but still want a treadmill? You’re in luck; a folding treadmill is a space-savvy solution. Folding treadmills are pared-down versions of regular ...