
Fitness and cross-training
Polar A370 fitness tracker with continuous heart rate
Polar A370 is a sleek and sporty waterproof fitness tracker that helps you stay on the pulse 24/7 with continuous heart rate monitoring, advanced sleep tracking and Polar’s unique workout features.
Find the balance: be active, have a rest and enjoy.
Discover the pulse with Polar A370
Meet Polar A370, the fitness tracker that keeps you on the pulse 24/7.

Get to know your heart
Learn how your heart behaves in the twists and turns of your everyday life. Polar A370’s wrist-based heart rate monitor tracks your heart rate 24/7, so you’ll get a complete overview of your daily activity. Polar A370 shows you how many calories you’ve burned, reveals your lowest and highest heart rate and shows you how your heart rate varies during the day.
When you’re working out, Polar A370’s heart rate guidance helps you train at the right intensity and drives you towards your fitness goals.

Sleep tight with Polar Sleep Plus™
Sleeping well is vitally important to your health and well-being. Polar’s new advanced Sleep Plus sleep analysis makes you an expert on your own sleep and helps you towards a more balanced lifestyle.
Sleep Plus gives you valuable insights to your sleep. It tracks the timing, amount and quality of your sleep and automatically detects when your sleep is interrupted. You can set your preferred sleep time and rate your sleep, and you’ll get sleep feedback. Learn about your sleeping patterns and think about what you can do to make the most of your night.

Get connected
Polar A370 is BFFs with your phone.
When you train outdoors, Polar A370 uses your phone’s GPS signal to track your pace and distance and to map out your route.
Polar A370’s smart notifications keep you in the loop even when you don’t have the time to check your phone. You get notifications for incoming calls, messages, social media and calendar appointments right on the screen of your Polar A370.

Keep on the move
Polar A370 is your ultimate training buddy. It makes your workouts easy and convenient with wrist-based heart rate tracking and helps you train at the right intensity with heart rate zones. Polar’s unique and scientifically validated Smart Coaching features guide you through your workouts and give you motivating feedback.
An active lifestyle is about healthy choices outside the gym as well. Polar A370 keeps you on the move in your everyday life — it gives you a daily activity goal and reminds you to get up and move if you stay still for too long.
Get to know Polar A370
Stay on the pulse

Activity Guide
Stay on the move every day. Polar A370 gives you a personalized daily activity goal that motivates you to keep moving throughout the day. Polar Activity Guide shows you how active you’ve been and gives you practical tips on how to reach that 100%. Read more ›

Activity Benefit
When it comes to a healthy lifestyle, even the small things make a difference. Learn how your active everyday choices benefit your health and well-being. Read more ›

Smart calories
Polar A370 helps you keep track of the calories you’ve burned. You’ll be able to see the calories burned during each training session and for the whole day. The continuous heart rate measurement combined with 24/7 activity tracking make sure your calorie burn is measured accurately and reliably. Read more ›

Fitness Test (H10 heart rate sensor required)
Hook up Polar A370 with Polar H10 heart rate sensor and test your aerobic fitness level without breaking a sweat in only five minutes. Polar Fitness Test measures your aerobic fitness from your resting heart rate, heart rate variability and your personal information. Read more ›

Sleep Plus
Polar’s new advanced sleep tracking technology gives you insights to your sleep. It monitors your movement with extreme precision to give you a comprehensive overview of your sleep.

Continuous heart rate
Stay on the pulse with 24/7 heart rate monitoring and get a comprehensive view on how your heart behaves during your day. Continuous heart rate monitoring helps.

Training Benefit
Learn more about the effects your training has on your fitness. Polar A370 gives you feedback right after each workout and tells you how your workout benefits your body. Read more ›

Running Program
Train for a running event with a personal and adaptive training plan in Polar Flow. Choose from four different targets, 5K, 10K, half marathon and marathon, and get a training plan that fits you and your goals. Read more ›
Wrist-based heart rate training
Heart rate tracking with Polar A370 is simpler than ever. Your heart rate is measured easily, conveniently and accurately with Polar’s proprietary 2-LED optical heart rate solution.
GPS via phone
Join forces with your phone to get all the data you need. Polar A370 uses your phone’s GPS signal to measure speed and distance and to map your route for your outdoor sports.
Speed and distance from the wrist
Not a fan of running with your phone? When you go for a run without your phone or jump on the treadmill, Polar A370 tracks your pace and distance from the movements of your wrist.
Training targets
Plan your workouts in Polar Flow and sync them directly to your Polar A370 to get guidance throughout your session. You can save your favorite workouts as favourites on your Polar A370 and do them again whenever you want.
Sport profiles
You choose how you move. Choose your favorite sport profiles from a list of over 100 sports and add them to your Polar A370 to get the relevant data to the screen of your Polar A370 when you work out. Sport profiles also help you to keep track of your training log in Polar Flow.
Smart notifications
Polar A370 keeps you connected with notifications from your phone. You’ll get alerts for incoming calls, messages, emails and calendar events.
Inactivity alerts
Sitting for too long is bad for your health. If you stay still for too long, Polar A370 gives you a vibrating alert to make sure you take those important active breaks.

Measurement
Weight | 31.7g (S), 37.3g (M/L) |
Wristband thickness | 13.5 mm |
Wristband width | 23.5 mm |
Wristband material | Silicone |
Wristband sizes | S, M/L |
Tech
Waterproof (WR30)
Wide-viewing angle full color TFT display with capacitive touchscreen
Screen resolution 80 x 160 pixels (RGB)
Screen size 13mm x 27mm
Polar proprietary optical heart rate module (2 green LEDs, 1 photodiode, analog front-end)
Rechargeable 110 mAh battery
Battery life up to 4 days with 24/7 activity tracking, including 1 hour of training per day (without smart notifications in use) with continuous HR
Connectivity
Easy wireless sync via Bluetooth® Smart with the Polar Flow app
Micro USB connector for charging and data sync with PC or Mac via Polar FlowSync
Compatible with:
* Computer running Mac OS X10.6 or later and Windows XP, 7, 8, 10
* Mobile phones running iOS10 or later and Android 4.4 or later
* Polar Balance smart scale
* Polar H10 heart rate sensor
* Apple Health Kit, Google Fit, MyFitnessPal and MapMyFitness
* More info on phone compatibility available here
Updatable software
UI languages: English, German, French, Spanish, Italian, Portuguese, Finnish, Swedish, Norwegian, Danish, Dutch, Japanese, Chinese (Simplified), Polish, Russian, Turkish, Czech, Indonesian
Complete your look
Put the finishing touch to your look with the right wristband. Polar A370 changeable wristbands are available in six colors and two sizes. The wristbands are made of a soft material and come with a secure buckle.

Free app and web service
Polar Flow — achieve more
Track your activity, analyze your progress and achieve more with Polar Flow – the complete fitness and training companion to your Polar A370, available on desktop and mobile.
Activity
Follow your daily activity and sleep, see your daily, weekly and monthly summaries and learn about the health benefits of your daily choices.

Training
See all your training data, analyze your performance and follow your progress. Analyze quickly in the app and in depth in the web service. Plan your workouts or set up a training program for a running event.

Get connected
Get social: follow your friends, share your achievements or join groups to find others who enjoy an active lifestyle. You can link your Polar Flow account to third party services, such as MyFitnessPal or share your training data with your PT with Polar Coach, Polar’s free online tool for coaches.


Boost your workouts with Polar and Les Mills
Polar and Les Mills have joined forces to create a fitter and healthier planet. Les Mills workouts are available as Polar sport profiles in Polar Flow. Add your favorite workouts to your Polar A370 and make sure you catch every sweaty minute.
Read moreBuy now
Support
Support and latest updates
Keep your Polar A370 up to date to take advantage of the latest features and functionalities. Visit our support pages for update info, user manuals and more.
Updates | See all | |
---|---|---|
2018.02.07 | Polar A370 firmware update 1.0.88 | › |
2017.11.06 | Polar Flow app version 3.6.4 for iOS | › |
2017.09.26 | Polar Flow app for Android (3.6.1) and iOS (3.6.2) | › |