Simply put: you can use your mind to control your lungs. You can use your lungs to control your breath and you can use your breath to control your nervous system. You can use it to change how feel right now. People used to think that was impossible.

Sometimes, I feel like I can fly. I have so much energy I think: if I jumped up now I’d just keep going - through the ceiling, out the roof and off over Dublin Bay. It wasn’t always like this though...

It happened suddenly. I was fine and then last night my eyes started to water, my nose started to stream, my joints began to ache: some pathogen (aka a little nasty thing) had entered my body. And my immune system's reaction was to throw everything at it. I thought: "Now, is a good time to put the Wim Hof Method to the test!"

Everything was white. The snow was thick and the wind was picking up. I was concentrating on each step, hiking up Poland’s highest mountain in freezing temperatures. A few feet ahead of me was Wim Hof. We had been chatting on the way up, but now he was leaping ahead, singing as he went.