I’m usually a very intuitive runner and pay extremely close attention to what my body is telling me – at the Haspa Hamburg Marathon, I brutally tested its limits. That hurt, but it took me another big step forward. I also rely heavily on science. Professor Karsten Hollander and his team at the Hamburg Medical School are giving me great support – many, many thanks! In the lab, by the way, we just found out which shoe optimally supports my performance.