Spartan Up!

“A must read for anyone looking to take his performance to the next level, be it in athletics or in life.” —Dean Karnazes, ultramarathoner and New York Times–bestselling author of Ultra Marathon Man

What do marathoners do when 26.2 miles just isn’t enough anymore? They try obstacle racing, combining the endurance challenges of a marathon with the mind- and body-bending rigors of overcoming obstacle...