Mark Sisson is a former 2:18 marathoner and 4th-place finisher at the Hawaii Ironman World Championships. He is also the founder of http://www.marksdailyapple.com and authour of The Primal Blueprint, promoting a healthy and balanced lifestyle aligned with the way our forefathers lived in prehistoric times.
An avid endorser of barefoot exercise, check this short video where Mark explains the benefits of "going minimalist" when it comes to footwear:
