Kathy welcomes Mark Sisson, the author of the best-selling The Primal Blueprint. Mark and Kathy talk about his transition from being an endurance "cardio junkie" to something more balanced. Along the way, they discuss some of what Mark has tried out and what he's doing to help extend his life as long as possible! (You'll want to stick around for that.) Mark sure to check out Mark's blog, Mark's Daily Apple. For complete show notes, visit www.kathysmith.com/podcas