In 2010, Choong became the first British athlete to win the European under-16 modern pentathlon title. He was also part of the British team that won a bronze medal in the relay event.[7]
Choong won the GB Open title and the British Junior Championships in 2013. In 2014 he successfully defended both titles with a score of 1,484 points to finish ahead of Team Bath teammates Joe Evans and Tom Toolis, who scored 1,468 points and 1,446 points respectively. Choong, Evans and Toolis combined to win the team gold medal.[11]
At the 2014 World Modern Pentathlon Championships held in Warsaw, Poland he finished 16th.[12] He qualified for the modern pentathlon at the 2016 Summer Olympics by finishing seventh at the 2015 European Championships held in Bath.[3] Choong was placed fourth after the first three events but dropped out of the top eight during the first laps of the combined run and shooting event before moving back up during the final lap.[13]
2016
In March 2016 at the Union Internationale de Pentathlon Moderne (UIPM) world cup event in Rio, which served as a test event for the Olympics, Choong was the highest placed British athlete, finishing thirteenth.[14] In April 2016 Choong achieved a career best finish in a world cup event as he finished fourth in Rome, five seconds behind the Czech Republic's Jan Kuf who took the bronze medal.[15]
Choong made his debut at the Olympics in Rio in 2016. He went into the final event, the laser run, in second place, but a poor event resulted in a 10th-place finish.[16]
In April 2021, Choong won an individual gold at the World Cup held in Sofia.[22]
In August 2021 at the postponed 2020 Tokyo Olympics, Choong took gold in the modern pentathlon event, which is the first ever gold for a British man in modern pentathlon.[23] It followed a win by Kate French in the women's competition at the same Olympics to complete a historic double at the Olympics for Britain, the first time a nation has won both.[24][25]
