Yabba dabba doo!

If it ain’t broke, you probably don’t need to fix it -- but a pair of German  designers have gone and revamped the bicycle anyway, an invention that has  remained relatively unchanged in over a century.

Without pedals or a seat, the “Fliz” as it’s called requires riders to strap  into a harness and build up speed by running, with their head sticking out  between the frame. If it sounds awkward, it’s because it probably is.