In the Fall of 2006, Dean Karnazes, known as the "Lance Armstrong of the running world," took on the ultimate challenge: running 50 marathons in 50 states in 50 consecutive days. Dean set off in a caravan packed with fellow runners, with nothing more than a roadmap and a determination that defied all physical limitations.

50/50 goes beyond the incredible story of these 50 marathons. It is a firsthand account of what happens when your body defies all limitations, and it is a fascinating story of what it's like to push the limits of strength under grueling conditions.

This book is also packed with Dean's secrets and training tips that runners everywhere will want to know. These include what to do when you hit a wall, how to adapt quickly to drastic terrain, how to get motivated after a really tough day, and the best diet and exercise tips to improve your own best time. Complete with Dean's practical tips on building endurance.