In this episode I talk with author Mark Sisson. Mark is a fitness author and blogger, a former distance runner, triathlete and Ironman competitor. We talk about running, training, and how to eliminate grains and other offending foods from your diet. In 1980 Mark qualified for the Olympic trials marathon, and in 1982 he finished 4th in the Ironman World Championship. He has written several books, including The Primal Blueprint, which incorporate aspects of the Paleolithic diet and lifestyle.