The Garmin Forerunner 620 is an innovative, run tracking GPS watch designed to enhance running and training performance. Distance and pace are measured through the watch's GPS, which is capable of sharing location data when synched with the Garmin LiveTrack application sold separately. This GPS watch wirelessly pairs with the Garmin HRM Run Monitor sold separately, allowing for heart rate monitoring and a whole host of other performance measuring statistics derived from heart rate measurement. Cadence, vertical oscillation, and ground contact time are all measured through the separate HRM Run Monitor. The internal accelerometer tracks distance when running indoors, eliminating the need for a separate foot pod. Ever wonder just how fit you are in comparison to peers of the same age Using an algorithm which crunches running speed, bpm, and heart variability, the 620 estimates your VO2 max. After estimating this key statistic, the 620 compares your VO2 max to those of similar age through its colored gauge. The 620 will even predict race times for several distances based on your VO2 max. This is key when training for marathons and other long duration running events, and it allows you to push physical limits every time you train until you reach the desired VO2 max and subsequent race time you're shooting for. Allowing you to implement a proper training schedule, the 620 learns your personal physiology based on heart rate data, and it factors this against your last workout, displaying how much time before you're fully recovered and ready for the next run. After you've completed a run, recovery time shows up, informing you of the proper resting duration before your next big workout. Color coded gauges are easy to understand and read, as green is go and red means rest or engage in light recovery exercise. Storing and sharing all of this data, the 620 works in harmony with Wi Fi hotspots and the Garmin Connect application free download online to automatically sy...