burundais runner Francine Niyonsaba , who suffers from an intersex condition, broke a world record on Tuesday. The 28-year-old set a new 2,000m record at a Continental Tour Gold meeting in Zagreb, Croatia, breaking the previous record by more than two seconds. Niyonsaba finished with a time of 5: 21.26, surpassing Genzebe Dibaba's 2017 record. Niyonsaba, silver medalist at the Rio 2016 Olympic Games over 800m, is one of the athletes banned by World Athletics from competing in women's 400m to one mile distance races due to what they consider to be high levels of natural testosterone of his body, his sensitivity to the hormone and his reluctance to undergo medical interventions to modify these characteristics. Niyonsaba a hyperandrogenism, a condition characterized by the natural production of more testosterone than unconditional women. READ: Running on a level playing field - Elite athletes fight for acceptance Read moreTo compete , these athletes must reduce their testosterone levels through drugs or surgery, which World Athletics says are intended to ensure fair competition In 2019, the Court of Arbitration for Sport (CAS) upheld the rules of the DSD from World Athletics when challenged by South African runner Caster Semenya. She lost a subsequent appeal and in February took her case to the European Courthuman rights. This case is still pending. Niyonsaba celebrates setting a new 2000m world record Niyonsaba declared in 2019 that requiring medical interventions from certain women in order to compete was a form of discrimination. It doesn't make sense. Of course, I didn't choose to be born as a That. I love to run, and I will not stop running. Niyonsaba has had a great 2021 so far, winning the Wanda Diamond League Title over 5,000m, as well as fifth in the 10,000m at the 2020 Tokyo Olympics. And in the 2,000m event - a distance not run at the Olympics or world championships - in Zagreb, continued his excellent form, dominating the race. Visit CNN.com/sport for more 'news, features and videos Finishing four seconds ahead of Freweyni Hailu, second with a final lap of 63 seconds, Niyonsaba became the new world distance record holder. I feel really good. I never knew I could break a world record, but it was my first time here. I came here to do what I have to do , she says after I did it. It 's wonderful and it ' s fabulous. The pace was really perfect. I want to thank everyone who came out to cheer us on.