Diving without oxygen tanks requires you to enact some very weird and very strange and not all that well understood physiological feats just to stay alive.
In July, Scots cyclist Mark Beaumont will attempt to cycle around the world in 80 days, smashing the world record by 43 days. Here's what he has to get right.
We all know that competing at the Olympics is the end product of years of training, but how much fuel do elite athletes need?
Organisers of the World Championship in Athletics will be on their toes after recent revelations of mass doping by endurance athletes. Here's what you need to know about doping and how to evade it.