The big numbers and three-button interface let you check training data without breaking stride. Stuck on the treadmill? The included foot pod (not pictured) works indoors and is almost as accurate as the GPS. It all means you can focus on running. Yet the simplicity belies a high IQ. Use the USB connector to upload pace, distance, and route data. Online training programs and heat maps tell you when and where to run; in-watch alerts remind you to.