This guide is for the endurance junkie. These workouts are all about building a badass engine. These workouts range from some renowned tests in the fitness community while others are workouts that I designed over the years as an athlete prepping for various events. Each of these workouts are uniquely designed with the end goal of making you better at enduring when the next challenge comes along. Some of the workouts have elite scores that can help you put a target out in front of you while training.