Malcolm Law is a 55-year-old adventurer, fundraiser, author and all-around cool guy who completed what’s being called the biggest feat of human endurance ever attempted in his native New Zealand.

He ran 50 off-road marathons while climbing 50 peaks over 50 consecutive days. He did it for a reason other than just testing himself — he’s raised more than $510,000 for the Mental Health Foundation of New Zealand. Now his adventures are being turned into a documentary film.

Malcolm calls into the Growing Bolder Radio Show from his native New Zealand to talk about this mission of love and describes his passion for big athletic adventures, something he never even was interested in until he hit 50.