Swiss Olympic athlete Fabienne Schlumpf has been diagnosed with myocarditis. SWISS marathon record holder and Olympic athlete Fabienne Schlumpf recently revealed she has been diagnosed with myocarditis and may never be able to compete again. The 31-year-old Swiss runner, who finished 12th at the Olympic Games in Tokyo, announced on her Instagram account on Thursday, January 6 that she had developed myocarditis and is not allowed to play any sports and participate in training. The post read: “BAD NEWS! Unfortunately, myocarditis is holding me back right now. It’s definitely not an easy time for me but I’m not giving up....