Most fitness fanatics define themselves as either runners or lifters. If you categorize yourself in the latter camp, then you're probably most comfortable clanking weights, slamming through supersets, and perfecting your Olympic lifts. Cardio? It's not for you—so you think.
We talked to Joe Holder, S10 performance trainer, Nike trainer/run coach, and founder of The Ocho System, to show you how to incorporate cardio in a way that enhances your training without stripping away any of your hard-earned muscle.