the united nations has condoned the iaff to regulate the levels of female athletes.t may be in breach of international rights and standards and backed a challenge by a south african in the court of arbitration for sport. she and other athletes must seek treatment to lower their testosterone levels if they wish to continue competing as women. so we'll get more on this from pablo from d.w. sports. welcome, welcome. so what are these new rules and why are they fighting them? >> at the center of this and we'll get to this, the athletic chiefs have said that women who have testosterone levels above the athletic body's limits for female athletes are not allowed to compete. they are looking to force so-called hyper androgynous athletes or those of differences of sexual development to seek treatment to actually lower their levels below a prescribed amount. the reason they want to do this, it's to create a quote level playing field for other female athletes. but this goes against what experts have been saying most notably in the british medical journal, they said that there i