Jumping into the Thames isn't something we'd normally recommend. But the River Rat Race, which will take place in London for the second time in 2015, requires you to do just that – and, as a fundraiser for Shelter, it's for an excellent cause. The 10km aquatic obstacle course will see participants run, jump, swim, kayak and climb their way around the Docklands in east London.
Starting inside the ExCel centre, participants will facing a quick fire barrage of obstacles before they head out on to the dockside. From there, there's a short run west towards the Emirates Air Line before they have to plunge into the Royal Victoria Dock. Next up is a short swim, followed by a thigh-deep wade to an urban beach. Back on dry land and heading east there's a mix of of jumping, swimming and wading. Then more running before a kayak section and an equally challenging homeward leg. And we haven't mentioned the biggest obstacle of the event yet: a jump that means plummeting 20 feet into the water below.