Feeling like you need more than just a stretch workout? Take it up a level with this Interval Pyramid Workout Class led by Fitness Trainer Kirk Kapple. In this class, you'll work on your anaerobic endurance by moving through two sets of exercises per pyramid. With each level, you'll increase the amount of time on each exercise from 15 seconds to 45 seconds by the end. If you're ready to sweat, grab your favorite yoga mat, a stick or foam roller, and press play.