The ancient art of running—possibly the most divisive issue of our times. Some people can’t go a day without it, while others would rather crawl through broken glass than try it. But love it or hate it, running is undeniably one of the quickest ways to get fitter and healthier. Starting with a 5K? That’s the perfect place to begin, especially if you’re not exercising at all right now. Why? Because this little challenge could lead to some seriously big, life-changing results.