HomeGet Involved What Is Triathlon? Heard about triathlon but still not really sure what it's all about? Here you can find out all you need to know! Become an Age-Grouper The GB Age-Group competition offers all Home Nation members a unique opportunity to compete up to an International Level. Membership As a member you can access a great range of exclusive related benefits designed with your swim, bike, run experience in mind. NEWS World Triathlon Age-Group Championship Roll of Honour 24th September 2023 Great Britain Age-Group Team out in force in Pontevedra 19th September 2023 British Triathlon Announce Age-Group Qualifiers and Championships for 2024 18th September 2023 British athletes ready to race at Championship Finals 18th September 2023 Super Series comes to a grand finale 13th September 2023 Age-Group Roll of Honour Europe Triathlon Championships 12th September 2023 Super Series Grand Final – Everything you Need to Know 7th September 2023