Does it seem like work when you’re on a treadmill? There may be a good reason why – as in how tread wheels evolved into treadmills. Ancient Greeks invented the crane to lift heavy loads in the late sixth century. Roman engineers took the Greeks’ design and built the Polyspastos Crane. The new crane allowed four workers to lift 3000kg using a winch on each side. The engineers then replaced the winch with the treadwheel (vertically attached to the crane). A worker would crawl inside the wheel (think hamster) allowing half the number of workers to lift double the weight
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