Joe DeSena’s new book "Spartan Fit!" comes out this summer. I have lots of jiu jitsu friends and sambo friends who do tough mudder and Spartan-type races. This book is a great training and motivational tool. All of the info including the first chapter download (Free!) is here: http://spartanracemedia.com If you like what you read, you can (and should) pre-order it HERE: http://bit.ly/spartanfit_ preorder I have SO much respect for people who run these Spartan races. They are tough! One of my good friends, a Caio Terra blackbelt near Dallas, runs these suckers and he's pretty addicted. Talk about functional fitness. You can hunt for a Spartan race in your area by going here. And if you use the code SPARTANBLOGGER you will get 10% off your entry fee.