Ultramarathon runner Karl Meltzer is more than half way done...
Yesterday, Geoff Roes had the chance to run 58 miles with Karl in one day. I guess, to understand how impressive this is you have to see it to believe it. Check out what Geoff writes about his run with Karl the other day on his blog
Keep up with Karl at http://RedBullUSA.com/HumanExpress