Charlie Engle is a world renowned ultra-marathon runner who has endured some of the worlds most punishing long-distance foot races including his run across the Sahara Desert, documented in the film "Running the Sahara." He is also a speaker and the author of the memoir called "Running Man."

In this wide-ranging discussion, he and the Commander talk about the personal difficulties with addiction that led to his career in running. 

Find out: How addiction manifests in different ways and doesn't always have to be negative At first, Charlie's running was an attempt to "beat" the addict out of himself About how Charlie became a kind of fitness coach for prison inmates 

Listen to this episode to gain insight into the running lifestyle and how to be able to go to extremes to accomplish a task.