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Pair your Forerunner® 620¹ with the Garmin HRM-Run to get your heart rate and real-time feedback about your running form. HRM-Run has an accelerometer in the module that measures torso movement to calculate 3 running metrics:
Cadence — the number of steps per minute. It displays the total steps (right and left combined).
Vertical oscillation — the bounce in your running motion. It displays the vertical motion of your torso (measured in centimeters).
Ground contact time — the amount of time in each step that your foot spends on the ground while running (measured in milliseconds)
¹Running dynamics features are available only on the Forerunner 620. HRM-Run is compatible with several other fitness products but will only display heart rate when paired.