Transgender people competing in elite sport have created new rules, made people take sides and like any competition, what is a defeat for some, is a win for others. It's over 40 years since the first high-level transwoman athlete stepped out in front of a crowd, but the debate still goes on – is allowing transwomen to compete in the female categories potentially giving them an unfair advantage? But is denying them the opportunity to participate a violation of their rights? On this episode, host Jayne Secker speaks to transwoman racing driver Charlie Martin, former Olympic swimmer Sharon Davies and Professor Tim Roberts, co-author of a new study on the competitive advantage of hormone therapy.