There are those who gauge their run based on nebulous things like overall effort. But most running nerds rely on a wearable to track pace, distance, and time. The Garmin Fenix 5 series is one of the company's newest products. It provides color topographic maps that help you create, find, and follow running paths in your area. It's not cheap, and if that's not in the holiday budget, Garmin's Forerunner series is another good option. $650.