minutes. Your total vigorous intensity minutes are doubled whenadded.Earning Intensity MinutesYour Forerunner device calculates intensity minutes bycomparing your heart rate data during an activity to youraverage resting heart rate. If heart rate is turned off, the devicecalculates moderate intensity minutes by analyzing your stepsper minute.• Start a timed activity for the most accurate calculation ofintensity minutes.• Exercise for at least 10 consecutive minutes at a moderate orvigorous intensity level.Sleep TrackingWhile you are sleeping, the device monitors your movement.Sleep statistics include total hours of sleep, sleep levels, andsleep movement. You can set your normal sleep hours in theuser settings on your Garmin Connect account. You can viewyour sleep statistics on your Garmin Connect account.Heart Rate FeaturesThe Forerunner 35 has a wrist-based heart rate monitor and iscompatible with ANT+®heart rate monitors. You must have aheart rate monitor to use the features described in this section.Wearing the Device and Heart Rate• Wear the Forerunner device above your wrist bone.NOTE: The device should be snug but comfortable, and itshould not move while running or exercising.NOTE: The heart rate sensor is located on the back of thedevice.• See (Troubleshooting, page 8) for more information aboutwrist-based heart rate.Viewing Your Heart Rate DataThe heart rate screen displays your current heart rate in beatsper minute (bpm) and your average resting heart rate for the last7 days.1 From the time of day screen, select .2 Select to view your heart rate data for the last 4 hours.Broadcasting Heart Rate Data to Garmin®DevicesYou can broadcast your heart rate data from your Forerunnerdevice and view it on paired Garmin devices. For example, youcan broadcast your heart rate data to an Edge®device whilecycling, or to a VIRB®action camera.NOTE: Broadcasting heart rate data decreases battery life.1 Select to view the heart rate screen.2 Select twice.3 Select Broadcast HR.The Forerunner device starts broadcasting your heart ratedata, and appears.NOTE: You can view only the heart rate screen whilebroadcasting heart rate data.4 Pair your Forerunner device with your Garmin ANT+compatible device.NOTE: The pairing instructions differ for each Garmincompatible device. See your owner's manual.TIP: To stop broadcasting your heart rate data, select anykey, and select Yes.About Heart Rate ZonesMany athletes use heart rate zones to measure and increasetheir cardiovascular strength and improve their level of fitness. Aheart rate zone is a set range of heartbeats per minute. The fivecommonly accepted heart rate zones are numbered from 1 to 5according to increasing intensity. Generally, heart rate zones arecalculated based on percentages of your maximum heart rate.Fitness GoalsKnowing your heart rate zones can help you measure andimprove your fitness by understanding and applying theseprinciples.• Your heart rate is a good measure of exercise intensity.• Training in certain heart rate zones can help you improvecardiovascular capacity and strength.• Knowing your heart rate zones can prevent you fromovertraining and can decrease your risk of injury.If you know your maximum heart rate, you can use the table(Heart Rate Zone Calculations, page 10) to determine the bestheart rate zone for your fitness objectives.If you do not know your maximum heart rate, use one of thecalculators available on the Internet. Some gyms and healthcenters can provide a test that measures maximum heart rate.The default maximum heart rate is 220 minus your age.Setting Your Maximum Heart RateThe device uses your user profile information from the initialsetup to estimate your maximum heart rate and determine yourdefault heart rate zones. The default maximum heart rate is 220minus your age. For the most accurate calorie data during youractivity, you should set your maximum heart rate (if known).1 Select > Settings > User Profile > Max. HR.2 Enter your maximum heart rate.Letting the Device Set Your Heart Rate ZonesThe default settings allow the device to detect your maximumheart rate and set your heart rate zones as a percentage of yourmaximum heart rate.• Verify that your user profile settings are accurate (SettingYour User Profile, page 7).• Run often with the wrist or chest heart rate monitor.• Try a few heart rate training plans, available from yourGarmin Connect account.• View your heart rate trends and time in zones using yourGarmin Connect account.Smart FeaturesBluetooth Connected FeaturesThe Forerunner device has several Bluetooth connectedfeatures for your compatible smartphone or mobile device using4 Heart Rate Features