As a coach, one of the most common goals runners come me with—whether training for a marathon, half marathon, or just trying to improve their general fitness—is also ways to feel BETTER when running, reduce fatigue, and run more efficiently (while also hoping to shave down those race times!) And while actually running EASY on your easy runs & doing the right types of workouts is a huge part of that, there's something else that can help: sprint interval training.

With all the tech we have access to these days—GPS watches, heart rate monitors, apps galore—it’s easy to forget that the most powerful training tool is the one you were born with: your own body.