The rugged fēnix multisport GPS watch lets you add mapping, music, intelligent pace planning and more to your workouts — so you can take any challenge in stride. Use preloaded activity profiles for trail and track running, swimming, running, biking, hiking, rowing, skiing, golfing and more. Optical heart rate technology gauges activity intensity as well as heart rate variability to calculate your stress level. It also tracks underwater without a heart rate strap. Get a full breakdown of your light, deep and REM sleep stages as well as Pulse Ox and respiration data. View it all on a dedicated widget that includes your sleep score and other insights. Receive emails, texts and alerts right on your watch when paired with a compatible device.