The Garmin Forerunner 620 Hrm Heart Rate Watch is the next best thing to having your own personal running coach! It features recovery advisor, race predictor and VO2 max estimate so you can train smarter. When used with the HRM-Run monitor Knowing your VO2 max is a great way to measure your physical fitness and improve your performance. When used with a heart rate monitor, the 620 crunches data, including your running speed, beats per minute and heart rate variability to estimate your VO2 max. Based on your VO2 max estimate, the 620 can predict your race times for several distances. The 620 is the first GPS running watch that provides feedback on your running form by reporting multiple metrics. When used with the HRM-Run monitor¹, the 620 reports your cadence, vertical oscillation and ground contact time. These metrics are called running dynamics, and they affect your running economy. It also features live tracking, which allows your friends and fans to follow along and see your stats in real time. Pair your phone with the 620 throughout your run to use LiveTrack. You can also share your victories by posting updates through social media with the Garmin Connect Mobile app. And, for real-time coaching as you run, the 620 is compatible with free training plans at Garmin Connect. By regularly connecting your watch to Garmin Connect, you'll also benefit from a faster GPS fix due to satellite data that will be sent to your device automatically.