Brand new rules have Caster Semenya cornered: she can either start taking drugs, or stop competing

South Africa's golden girl Caster Semenya's athletics career is on the brink after the latest World Athletics rules regarding transgender athletes and athletes with differences of sexual development (DSD).

On Thursday, World Athletics released new, stricter policies governing the women's category, barring trans athletes from competing and enforcing more stringent rules for DSD athletes, which included further lowering of their testosterone limit levels to below 2.5nmol/L (nanomoles per litre of blood).

This is down from the current level of 5nmol/L, and forces DSD athletes to maintain levels below 2.5nmol/L for two years rather than just one, as is the case presently.