If you have an established fitness regimen, it can be difficult to maintain it while you’re on the road. Fortunately, there are ways to keep active while away from home—and do so in a way that can be even more fun than your everyday routine. Here are some of our favorite ways to keep active in a new destination:   Run (or Walk) the Streets. With apps like Strava and MapMyRun, active travelers can get their run (or walk) on...