Garmin Support Center is where you will find answers to frequently asked questions and resources to help with all of your Garmin products.. You can work toward achieving your weekly intensity minutes goal by participating in at least 10 consecutive minutes of moderate to vigorous intensity activities. The device adds the amount of moderate activity minutes with the amount of vigorous activity minutes. Your total vigorous intensity minutes are doubled when added.
Your Venu ® 3 series watch calculates intensity minutes by comparing your heart rate data to your average resting heart rate. If heart rate is turned off, the watch calculates moderate intensity minutes by analyzing your steps per minute. Start a timed activity for the most accurate calculation of intensity minutes.. My intensity minutes come far more easily than your figures suggest. For reference my RHR is about 48-50. My Max is 195. Yesterday I rode a steady base ride for 78 minutes, with just a couple of small surges. Average heart rate was 119 or 61% of max. I scored 4 minutes moderate and 74 minutes intense, even though the activity was anything but.