Over the last few decades, societies all over the world (not all, obvsly) have come round to the long-overdue realization that you can be whatever you feel yourself to be. Compared to  other areas, this remains arguably the most polarizing issue in sport. This week, we speak to the brilliant Prof. Karolin Heckemeyer on the archaic gender ideals of sport, the narrative of competitive fairness and perhaps more importantly, whether there could be a  future whereby individuals can compete in whichever gender category they identify as, without discrimination.