Ultramarathon Runner Charlie Engle went from being a drug addict to a marathon runner to a convict. He tells us why despite all the unfortunate events in his life, he was still able to be in control of his happiness.

Watch the full talk:    • From Drug Addict to Ultramarathon Run...  

Google Zeitgeist is a collection of talks by people who are changing the world. Hear entrepreneurs, CEOs, storytellers, scientists, and dreamers share their visions of how we can shape tomorrow.