I recently read a short article about exercise bikes at McDonald's. The photo with the row of bikes in the restaurant made me curious enough to take a look at the short article. I have to say that I was quite surprised to find out what the idea was, because when I saw the photo, I already had my own theory. I was sure that these bikes were to encourage people to do some sport after eating unhealthy food from McDonald's. Maybe people need to burn calories before they can leave the restaurant. In reality, the idea was quite different. When customers ride the bikes, they produce electricity that they can use to charge their phones, for example. The bikes are part of a project that promotes upcycling. The bikes themselves are made of recycled plastic. When we wanted to use these bikes to burn calories from a Big Mac, we would have to pedal for over an hour.