They have an entire page claiming that their bike is more efficient than a traditional bike: https://www.kwigglebike.com/en_US/home-kwiggle-vorteile https://ww

They have an entire page claiming that their bike is more efficient than a traditional bike: https://www.kwigglebike.com/en_US/home-kwiggle-vorteile https://www.kwigglebike.com/en_US/home-kwiggle-vorteile I've never ridden one so I'm not in any position to judge it, but the position sounds similar to an elliptical bike.