Caster Semenya has achieved a lot. An Olympic and World champion, she’s won her last 29 races in a row. But yesterday the 28 year old South African lost her appeal against regulations restricting testosterone levels in female runners. Should she be punished for having a physical advantage? The South African sports journalist Mohammed Allie visited the village where she grew up and BBC Gender and Identity Correspondent Megha Mohan unpacks what Caster Semenya means for our understanding of gender.

Producers: Harriet Noble and Duncan Barber