If you like this video short by L-Studio, you can read more David at his website. He is an active member of the  Navy Seals and avid ultra-marathon runner and triathlete.

He took up endurance running fairly recently and as his first triathlon completed the grueling Ultra-Man (more than a double Ironman!). I love to see stories about people like David, who are shattering our limiting beliefs about the human potential.