Ever feel like there’s too many birds and not enough time? Are you torn between the thrill of the chase and the everyday slog of going to the gym? Well, perhaps it’s time to start pulling double duty by combining the two sports. Some experienced birders have started doing just that, and they’re calling it run-birding. According to a 2016 U.S. Department of Labor report, nearly 9 percent of Americans ages 15 and older run to stay in shape. U.S.-based birders, meanwhile, number at around 45 million. If you engage in both of these activities, or aspire to, you might consider combining a fitness plan with your next foray into the field. Running is inexpensive and requires minimal gear, as does birding. What’s more, they allow you to take a reprieve in nature while also honing your senses and awareness of the world. These four run-birders show you how. Run to enjoy the real-life playlist. Katie Barnes of Daphne, Alabama, skips the headphones and...