Saturday 22 August 2026 · Sea Lanes, Brighton
100×100
10km · a marathon swim

Nine of us swam 10k at Sea Lanes in Brighton, split into a hundred 100s. All nine got to 100.

When
Sat 22 Aug 2026
Where
Sea Lanes, Brighton
Distance
10km each
See our next event
10km
Marathon distance
100
Reps of 100m
200
Lengths
Sea Lanes
Brighton seafront
How it went

We did 10k in Brighton.

On Saturday, nine of us swam 10k at Sea Lanes in Brighton. That's 200 lengths and quite a lot of staring at a black line.

We contended with the cold (all props to those who did it in skins) and had a great view of Brighton in the sun. Everyone was super awesome and there was a lot of Haribo, a lot of water bottles and a lot of laughing.

Well done to all eight of you. It was such a good morning.

The swimmers on the poolside at Sea Lanes after finishing the 100 x 100
A swimmer in a wetsuit at the wall, giving a thumbs up mid-set
Swimmers resting in the lane between reps, with a tub of sweets on the poolside
A row of drinks bottles lined up along the poolside
The empty 50m pool at Sea Lanes early in the morning, with the sea behind

Sea Lanes, Brighton · 22 August 2026

The challenge

Nine swimmers completing one swimming marathon!

A 10k swim is the same distance they race at the Olympics, so Saturday was a marathon by any measure. Ours just happened to be in a 50m pool by the sea.

We split it into a hundred 100s to make a proper challenge of it as well. Watch this space for more challenges in the future.