The forerunner 15 gps watch captures essential stats from your run like time distance heart rate and pace and can be used an activity tracker between runs used with an hrm included it records your heart rate and heart rate zone so can keep your training in the right zone used as an activity monitor the forerunner 15 counts your steps and the calories you burn all day plus it reminds you when its time to move if youve been sitting for more than an hour when you get the cue you need to