Bus

Once you've dragged yourself to work and back, it can be difficult to find the time or motivation to go to the gym. London-based gym 1Rebel has come up with a solution in the form of a fleet of buses converted into mobile spinning studios. Passengers will be able to exercise during their commute.

One man's waste is another's man's bus fuel, so the saying might now go. Indeed, next time people in the UK go for a number two, they could be powering the number two bus. Geneco's new Bio-Bus is powered by gas generated via the treatment of sewage and food waste.

NYU graduate student Marco Castro Cosio has hit upon the idea of planting gardens on some previously wasted space found on city streets – the roofs of buses.