I was privileged to have an athletic career at a time of emergence of equity in middle-distance and distance events for women. The inclusion of the marathon in the 1984 Olympics was a huge milestone achieved by the efforts of women runners around the world lobbying to have their own category as female competitors. Without this biological distinction I, and my fellow women competitors, would never have been selected to run in the Olympics, and I certainly would have had zero opportunity of realising my lifelong dream of standing on the Olympic podium. While I appreciate that transgender people wish to compete in the category of their choosing, the well-documented hormonal advantage of biologically-born males over females simply undoes all that we worked so hard for. I would fully support transgender women lobbying for their own category, as pioneering sportswomen successfully did in the late 20th century.