Rosie51 the testosterone levels of athletes are not the same as ordinary people. There is a very interesting solution suggested in this article ^https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5570685/
It suggests using 10 criteria similar to the system used in the Paralympics.^
What if we were to match the 10 categories of impairment to 10 categories of advantages, where we list all known biological elements that provide a competitive edge, such as LBM, height, vision, muscle strength, oxygen carrying red blood cells, lung size, etc.? We could then assign each athlete a numerical grade in relation to the sport they wish to compete in. Similarly to the IPC classification code, for each sport, the calculation would be different, prioritizing specific traits that benefit athletes in that particular sport. Using a list of advantages rather than looking for a single perfect criterion may help mitigate problems resulting from trying to enforce rules based on non-existing biological dichotomies.
This system would constitute a complete reimagining of our current way of thinking—a plan to ‘start over’. It may be that some sports would remain ‘sexed’ due to consistent differences between males and females within the ‘advantages list’, but other categories would be completely shuffled, producing new winners and losers. After the 2016 Olympic Games in Rio, where three athletes in the Paralympics had better times than the gold medalist in the Olympics 1500 m race,73 it is easy to imagine that those traditionally considered disadvantaged would outdo the ‘advantaged’.