"A must read for anyone looking to take his performance to the next level, be it in athletics or in life."--Dean Karnazes, author of Ultra Marathon Man

"If there's anyone out there who has taken extreme to a new level, its Joe De Sena--in adventure racing, in business, and ultimately in the business of adventure Spartan Up is must-read."--Robyn Benincasa, world champion adventure racer and New York Times best-selling author of How Winning Works

What do marathoners do when 26.2 miles just isn't enough anymore? They try obstacle...