1998-2012: Laurel Hubbard fails to qualify for a single international men's tournament as a professional weightlifter

2013: Hubbard 'transitions' (aged 35)

2014-21: Hubbard qualifies for 11 international women's tournaments, including the Olympics

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2013-15: Hannah Mouncey made 22 appearances for the Australian men's handball team, scoring 0 goals

2015: Mouncey 'transitions'

2018: Amid controversy, Mouncey is allowed to play 6 times for the Australian women's handball team, scoring 23 goals

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Pre 2015: Golfer Hailey Davidson won 0 men's tournaments (in fact it doesn't look like Davidson even qualified for any tournaments)

2015: Davidson 'transitions'

2021: Davidson becomes the first male to win a women's professional golf tournament

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2019: Mary Gregory, who had 'transitioned' as an adult, took up professional women's weightlifting and, at Gregory's first tournament, won all nine events at the 100% Raw Weightlifting Federation competition, breaking four world records in the process

After 'transitioning' as a teenager, Maxine Blythin played cricket for both a men’s cricket team where Blythin had a batting average of 15, and the Kent women's cricket team, where Blythin had an average of 124 and was named women's cricketer of the year

'Before transitioning and competing in the women’s events, Kenzie Statz didn’t fare well in the men’s competitions. But [now] the transgender cyclist finishes more than 10 minutes ahead of the next closest competitor.'

Pre 2017: Tiffany Abreu is a volleyball player in Brazil's men's Superliga A & B divisions

2017: Abreu 'transitions'

2018: Abreu breaks Brazil's women's Superliga’s single game scoring record against a team that contained three Olympic gold medalists

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2014: Chelsea Wolfe 'transitions' and, the same year, takes up BMX cycling

2017: Wolfe switches to BMX Freestyle after discovering it's an Olympics event

2021: Wolfe is set to be one of the three Team USA BMX Freestyle women to qualify for the Olympics

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Up until 2012: Jillian Bearden is an elite men's cyclist but didn't quite make it to a professional standard

2014: Bearden transitions (aged 34)

2016: Bearden wins the Arizona El Tour de Tucson and becomes a professional peloton cyclist the following year

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2012: Savannah Burton plays for Canada's men's dodgeball team, but it doesn't work out and Burton quits dodgeball

2013: Burton 'transitions'

2015-17: Burton returns to dodgeball and plays for Canada's women's team at two successive world championships

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https://twitter.com/ripx4nutmeg/status/1405799337272262658

2000: Lauren Jeska 'transitions' and takes up fell-running

2010-12 Jeska wins numerous women's events including the 2012 British Fell Running Championships

2017: Jeska is jailed for the attempted murder of a coach who asked to see Jeska's hormone levels

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This may be the most insane: https://twitter.com/ripx4nutmeg/status/1401289400407973889

Gabrielle Ludwig 'transitioned' to a woman aged 50, in 2012, and immediately joined Mission College women's basketball team. Ludwig, who is 6 foot 8, 'led the team in scoring with 17 points a game and led the state in rebounding with 18 a game'