Join the Rat Race - at Newham's Royal Docks
A 10km water-based obstacle race which includes a 20ft jump down into freezing water is being brought to Newham.
Organisers of the event, due to take place at the Royal Docks on August 16, say it's the first time such a race has been held in the capital.
Jim Mee, managing director of Rat Race, said: "We're going to make the ultimate splash in London. It's a cracking destination, right next to the Excel, with a fantastic body of water, already used for sports so water quality is relatively good.
"And for us it's a massive blank canvas to have some fun with."
Competitors will face obstacles inside the Excel before running towards the Emirates Air Line, with more obstacles along the way.
They then take their first dip in Royal Victoria Dock via a water jump. After a short swim they take an energy sapping wade on to the urban beach.
More jumping, swimming and wading follows before a sprint to the kayak section, where a paddle is followed by a few more surprises.
Jim said: "Some people there want to win - say, the top 5% - and others are there with a pair of trainers and a sense of humour.
"The jump into the dock can be scary but it's a real mix."
So far 1,500 people have signed up for the 5,000 place event. It costs £48 and homelessness charity Shelter gets £10 from each entry.
Go to londonriverratrace.com