Best Cardio Ever: 15 Ways to Make It Really Work

Be Miles Better

"While running or walking, try to keep your entire body loose and make sure your arms aren't crossing over your body," says Tom Holland, exercise physiologist, running coach and author of The Marathon Method. Otherwise, you're wasting energy and losing both momentum and speed. "If you notice any tension, breathe deeply and then imagine sending air to your tight spots as you exhale," he adds.

To walk or run faster, stand tall and bend your arms, says Fenton. Keeping your arms straight as you go requires much more energy. "You don't have to swing in an exaggerated motion -- let your thumb come up to chest height, then graze your waistband when you move your hand back," he says. And push off all of your toes, too. "Doing this will give you even more momentum for the next step."