The Kwiggle Move
Kwiggle and rider form a dynamic unit
The rider relaxes his grip of the handlebars a little bit. Then the Kwiggle alternately rocks to the side by itself, the saddle swings to the other side, makes room for the leg pedalling down and lifts the rider's weight back to the optimal pedal pressure point. This way you can ride fast (approx. 27 km/h - 17 mph in the video) and ergonomically optimal.