Imagine you do karate for fun, but are being trained by a 10-time European champion and it only costs you around 20 ($23) a month. Sound unlikely? In Germany, it is possible. At the Dojo Ochi karate club in the western city of Bonn, Melissa Rathmann volunteers as part of an eight-person team of coaches. In addition to her 10 European Championship titles, the 33-year-old has won numerous German championships and was twice runner-up in the World Championships.