Many people struggle to run a mile; others can knock out a 10K on a whim. A few brave souls take on "ultramarathons" — races longer than 26.2 miles (42.2 kilometers). But how far can a human run ...

Is it possible to be as fit in your forties and onwards as you were in your thirties? Perhaps even fitter? Yes it is, say fitness experts: there are plenty of people in their forties and even fifties ...

Because books can do that. Dean Karnazes’s Ultramarathon Man inspired hundreds or thousands of people to try ultrarunning, Colin Fletcher’s books inspired probably thousands of people to take ...