Imagine running 50 miles – almost double the distance of a typical marathon. Do you think you could ever do it? Dean Karnazes, an ultra-runner, joins Viewpoints this week to break down the extreme sport of ultra-marathons. He’s been tackling long distances and smashing records for several years and has made a name for himself in the running world. We hear his story and some tips he has for people who are trying to slowly ease into everyday running.