Challenges faced on Karls 2000 mile run Red Bull Human Express

Check out more action here: A look into the challenges faced by ultramarathoner Karl Meltzer as he continues on his 2, 000+ mile journey following the historic Pony Express trail. While running halfway across the country is difficult itself, he also faces wild terrain, unpredictable weather and a worrying lack of water. Track Karl s live progress at Experience the world of Red Bull like you have never seen it before. With the best action sports clips on the web and original series, prepare for your stoke factor to be at an all time high. See into our world: Red Bull on Facebook: Red Bull on Twitter: Subscribe to Red Bull on Youtube: Subscribe to the Red Bulletin: Sign up for our Newsletter here: