Ever wondered where the active/good trails are in your area? Or just wanted to see where people go running in Boston? Well you'll definitely dig what Strava released which is an entire global interactive view of the globe, grabbing the tracking data from the Strava apps and displaying in a heatmap way.
We have to hand it to Strava, too. Not only did they do a great job with executing this idea, it makes it also very handy since you can see the popular/active trails that the locals run on. So check it out: