Pair your compatible Garmin device with the 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).