When it comes to pumping us up with life-renewing endorphins, few forms of exercise beat running. Beneficial as it is, though, it can be hard on your knees, and it can stress out your entire body to the point of aching all over. Good running shoes are essential. You want a pair that fit well and provide strong, solid support while being flexible enough to give your feet a wide range of movement. Equally important is built-in ventilation that lets your feet breathe easily while you hit the road. By the time you cross the finish line, you won’t be left with smelly shoes and toes.