Not only does the Garmin Forerunner 645 just track your activities, it provides deep analysis and insight so you can digest the data. Customizable data pages and activity profiles make it easy to display your data the way you want to see it. You can easily see your GPS speed and distance, your interval training and advanced workout statistics, your VO2 max., your training status, your aerobic and anaerobic training effects, the activity history on the watch, and much more.