Australian handball player Callum Mouncey was sitting in a pool on the roof of a hotel in Qatar when he made the decision to become a woman.

He dried himself off, went downstairs and sent a Facebook message to his mum, because he wanted her to be the first to know.

Hannah Mouncey used to play handball for the Australian men's team, now she wants to play for the women. Credit:Rohan Thomson

Then in May the 26-year-old went to Albury on a Friday as a man and returned on the Sunday to Canberra, where she has lived the past eight years, as a woman.

Now Hannah Mouncey wants not only to raise awareness of transgender people through working with the Pride In Sport program but to represent the country as a woman – potentially becoming the first person to do so in a team sport as a man and a woman.