Whether you set your sights on running a 10K, or you aspire to turn your part-time hobby into a full-time business, the path to achievement doesn’t always come in a straight line. And while there’s a lot to be said for perseverance, sometimes it just makes more sense to quit.  Quitting doesn’t mean you’re a loser. In fact, it often takes incredible mental strength to walk away from a goal you’ve set for yourself.