Trans women retain physique, stamina and strength advantages when competing in female sport, even when they reduce their testosterone levels, new guidelines for transgender participation in national and grassroots sport published by the UK sports councils will say on Thursday. The long-awaited report argues there is no magic solution which balances the inclusion of trans women in female sport while guaranteeing competitive fairness and safety. And, for the first time, it tells sports across Britain that they will have to choose which to prioritise.

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