Charity Parkinson's UK is looking for volunteers to take part in a swimming race in The Serpentine in Hyde Park, the same waters used for marathon swimming and triathlon events in London 2012.
The 110m race is split into four categories: men, women, 7-11 year olds and 12-16 year olds, with heats and a final race for each category. Prizes and medals are up for grabs for the stealthiest of swimmers.
There's a £10 entry fee for each person, and swimmers are expected to collect sponsorship too (with a prize for the swimmer who raises the most). If you don't fancy taking the plunge yourself, spectators can come along for £1 — food and entertainment will be on offer. After all, someone needs to hold the towels.
Swim The Serpentine takes place on 4 October, and participants need to register in advance.