Transgender athletes "are not a threat" to women's sport, says American swimmer Lia Thomas.
Great Britain's Hector Pardoe thought he had "lost an eye" after taking an elbow to the face in the marathon swim, forcing him to pull out.
In new BBC documentary, Ellie Simmonds: A World Without Dwarfism, the Paralympic athlete explores a controversial new drug for children with achondroplasia.
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