>>1835313Yes exactly, you need to extend and contract your legs synchronously to make the seat bob up and down and turn the crank, as opposed to the fixed seat position and alternating leg extension in OP's bike.
https://www.youtube.com/watch?v=Dpovq9rjSxsThe creator has since returned with a similar model with more handlebar movement fore and aft allowing you to exercise your arms a little as well.
https://www.youtube.com/watch?v=tViGRhZrj60Both bikes have been marketed with the keywords "Swingbike" (contrary to the Schwinn Swing Bike which has two wheel steering) or "Reitrad" (German for "riding bike" as in horseriding because we normally say "drive a bike").
