This was a cool project for the city of Bruges (in Belgium). They wanted a mobile activity station they could place in the city to engage the youth to move more.  So, it had to be compact, durable, and their had to be some sort of fun factor or reason to make the users come back as much as possible.

I added a clock on top of the trailer, when one of the two users start cycling music will start playing and the timer starts running. This way there is a competitive aspect which will result in different implementations.