1. Running makes you happier.
If you’ve been working out regularly, you’ve already discovered it: No matter how good or bad you feel at any given moment, exercise will make you feel better. And it goes beyond just the “runner’s high”—that rush of feel-good hormones known as endocannabinoids. In a 2006 study published in Medicine & Science in Sports & Exercise, researchers found that even a single bout of exercise—30 minutes of walking on a treadmill—could instantly lift the mood of someone suffering from a major depressive order. In a May 2013 study in Medicine & Science in Sports & Exercise in which rats and mice got antidepressant-like effects from running on a wheel, researchers concluded that physical activity was an effective alternative to treating depression.