Just north of London and easily reachable by Tube, Hampstead Heath is a wonderful and hilly running area in the affluent Hampstead residential area. The historic heath is a great collection of views and landscapes, part open and part wooded. It’s also great for hill training. Rather than proscribing a particular route, we’ve included a link to three trail options: a 6-mile ‘Heath Circuit’, which covers most of the park. The 1.5 mile loop around Parliament Hill is a nice add-on.