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" Whenever I take on a challenge, I know I have the best chance of succeeding because my asthma is under control," says Mogens.

Asthma explained

Find out more about this debilatating condition with our interactive guide to the causes and symptoms.

"My preparations and asthma medication ensure I perform to the best of my ability, even under the most extreme of conditions. This was essential for me in planning my ascent of Everest," he says.

"I want to set an example and maybe be an inspiration and a motivator for other asthmatics - to show them that if you dream it you can do it. I was taught that you should never limit yourself and that you should go beyond your wildest dreams and imagination. I have taken control of my asthma and not allowed my asthma to control me."