Entries for London Duathlon 2023 are now closed. But if you're wanting to take on the world’s biggest run-bike-run challenge in 2024, register your interest below. Look at all the distances you could take on:

Half Duathlon: 5km Run, 22km Bike, 5km Run

Full Duathlon: 10km Run, 44km Bike, 5km Run

Ultra Duathlon: 20km Run, 77km Bike, 10km Run

Duathlon Relay: 10km Run, 44km Bike, 5km Run (2 or 3 people)