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.
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.