This GPS smartwatch tracks your stats, crunches the numbers and gets to know all about your performance, your running form, your training and even your goals. These adaptive training plans feature guidance from expert coaches and free training plans that adapt to you and your goals. Workouts sync right to your watch. Switch up your workout routine with activity profiles for cycling, pool swimming, indoor rowing, elliptical, stair-stepper and more. Get heart rate data3 along with alerts if your heart rate stays high while you're at rest. Gauge how hard your heart is working during activities, even underwater. Track where you run, and get accurate stats, including distance, pace and intervals. When used with a compatible accessory, Forerunner 245 measures crucial running metrics such as cadence, stride length, ground contact time and balance and more. Train smarter with VO2 max, an indicator of how you can expect to perform. This metric even accounts for changes in performance that could be caused by heat or altitude. This wrist-based sensor estimates your body's blood oxygen saturation4, which can help gauge how your body is absorbing oxygen - especially while you sleep. This metric evaluates your recent exercise history and performance indicators to let you know if you’re training productively, peaking or overreaching. See how your workouts influence the development of endurance, speed and power with aerobic and anaerobic training effect feedback. This stat measures your exercise volume from the last 7 days and compares it to the optimal range for your fitness and recent training history. Run your heart out with a watch that's got the power to keep up. You'll get up to 7 days of battery life in smartwatch mode and up to 24 hours in GPS mode.