The marathon is one of the toughest races around, but what's the furthest you've ever run?
A quick burst to catch a bus can seem like hard work sometimes.
So how would you deal with running 150 miles across a desert in stifling heat over seven days?
Or jumping on a bike for a 3,000 mile ride from one side of America to another?
There are plenty of events that make the 26 miles of an event such as the London marathon look like a stroll in the park.
The Academy took a deep breath and investigated the lengths some athletes go to in their quest for glory.
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