The London Fields Aquathlon sees competitors swim in East London’s only 50m outdoor heated pool before

At the point of entry you will be required to enter a predicted swim time which be used to dictate the start lists. Please be as accurate as possible when entering your swim time and consider doing your own timed swim if you are unsure of your swim time.

The junior event distances depend on the participant’s age category (age determined as on 31st December):
TriStar Start (8 years old) — 50m swim, 500m run
TriStar 1 (9–10 years) — 150m swim, 1.5km run
TriStar 2 (11–12 years) — 200m swim, 1.5km run
TriStar 3 (13–14 years) — 300m swim, 3km run
Youths (15–16 years) — 400m swim, 4km run
Juniors (17–19 years) — 400m swim, 4km run