The traditional obstacle course moves to the next level when the London River Rat Race returns to the waters of the Royal Victoria Dock on July 25.
The 10km aquatic race will see participants run, jump, swim and kayak their way around the course with the charity Shelter being the ultimate beneficiary.
Among the wet and wild challenges are the “zorb pool”, water trampolines, a 50ft water slide and a 20ft jump off the dock.
Entry to the event starts from £70 plus a £10 standard donation to charity Shelter, with further money going to the charity through the sponsorship funds raised by each participant.
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The race will start inside the Excel centre with participants facing a quick fire barrage of obstacles before they head out on to the dockside.
From there, they will run west towards the Emirates Air Line, a good warm-up ahead of the first dip in to the water via a low jump which will be followed by a short swim and then an energy sapping, thigh deep wade on to the beach.
Back on dry land they will then head east with a mixture of jumping, swimming and wading required, before the running kicks in again to lead them on to the kayak section facing more challenges and surprises before they cross the finish line.
Race creator Jim Mee said: “At 10km, the course provides a good fitness challenge, but the water elements make it a lot of fun, especially when the sun comes out.
“Whether you do it solo, or form a team, all you need to take part is a pair of trainers and a sense of adventure. And most importantly, every step you take, every splash you make, you’ll be raising money for individuals and families struggling with homelessness or housing issues in Britain today.”