Originally Posted by bbattle
The original Ingo bike, 1935
Notice the eccentric rear hub. You got the bike rolling then "pumped" the platform to turn the rear wheel.
Now that's a real interesting idea. I would think it would be a little awkward to ride, but it's cool to see different approaches. The basic idea is like playground swing.
There's a sort of technique in mountain biking called pumping. You time the movements of you body to match the crests and troughs of the terrain to gain speed without pedaling.