Polar A370 Review – Fit To Be Your Fitness Tracker?

cardiocritic review polar a370 fitness tracker


Heart Rate Functionality


Fitness Monitoring 


Ease of Use


Battery Life


Where To Get It

A Deep Dive Into Polar A370

The Polar A370 builds on the brilliant A360 (4.5/5 Star Review) adding some great new features including:

  • advanced sleep tracking,
  • 24/7 heart rate (HR),
  • GPS sharing, and 
  • HR broadcast (Bluetooth). 

The Polar A370 is one of the best activity trackers on the market with a high quality colour display and changeable wrist straps. This review of the Polar A370 has been written and prepared by Tristan Haskins aka CardioCritic.

polar a370 range colour options pink green white orange black blue
  • Who Is It For?

  • Video Review

  • Comparison

Polar A360 vs A370

polar a370 with optical LED heart rate sensors

Cosmetically, the Polar A360 and this A370 are almost identical but there’s several new technical features that justify the extra cost.

  • 24/7 Heart Rate Monitoring option – your heart rate is recorded throughout the day.

  • Daily summary (found in My Day) providing feedback on lowest heart rate (resting HR) for both DAY and NIGHT plus maximum HR. Having resting heart rate for day and night is unique and useful feature not found on any other monitors I am aware of.

  • The A370 has a sample rate of 5 minutes, however, when it recognizes that you are exercising it increases this to a higher resolution (similar to regular exercise mode e.g 1 second) to give better heart rate representation throughout unplanned training activities.

  • Heart Rate Broadcast – transmit your heart rate to any compatible device. For example, Polar M460, M450, iPhone or Android phone running Polar Flow, Strava, Endomondo etc.

  • Advanced Sleep Tracking using Polar’s new Sleep Plus algorithm providing a more accurate representation of your sleeping patterns.

Main Features and Functions

Product Photos (from Polar)

polar a370 pink green black different screens

I will be adding my own photos of the Polar A370 once I have finished testing the watch. In the meantime, please accept these Polar marketing department photos. This one demonstrates the following

  • Polar A370 smartphone alerts
  • One of the many watch face alternatives
  • Heart Rate Zone training

Exercise Mode

polar a370 supports over 100 sport profiles

In Exercise Mode you get to select the exercise that most closely reflects your work out. There are over 100 different sport profile that can be loaded in the A370.

Les Mills Training Programs

polar a370 with les mills fitness programs

Recently Polar added dozens of Les Mills training profiles. If you’re not familiar with the world’s most popular online work out programs, please visit Polar Les Mills information page.

More Features

(Click or tap below to expand)

My Day Summary

Speed & Distance while Training

Heart Rate in 5 Zones

Polar Flow APP

24/7 Activity Tracking


When was Polar A370 Release Date?

The release date of the Polar A370 was June 2017.

Is the Polar A370 waterproof?

Yes, up to 30 meters deep. 

You can wear both A360 and A370 while swimming or taking a shower. This Polar fitness watch will still be able to function. It can still count steps, track how many calories you burned and pinpoint your GPS (when tethered off your phone).

But, just note that the heart rate measurement may not be as accurate while you’re in water.  

How do I sync my Polar A370? 

It’s actually quite easy.

  1. Open up the Flow app on your smartphone.

  2. Take out your A370. Press the button on the side and hold it. You should see the word “searching” pop up on the screen a few seconds later.

  3. After the watch has found the device it should connect to, it should take you through a sequence of confirmations: from Searching > Connecting > Syncing.

  4. Once it has successfully finished pairing, it should show the word “Completed.”

How do I reset my Polar A370 fitness tracker watch?

You only need to reset if you are experiencing technical difficulties and have tried all other solutions.


Because resetting means that you’ll lose all the collected fitness data, and you’ll have to set it up like a brand new tracker again.

If it’s your last resort, follow these instructions below:

  1. Take out your A370 fitness watch and go to Main Menu > Settings > Power Icon.
  2. The words “Turning off” will show. Press the power icon again and hold for 5 seconds.

How do I change the time on my Polar A370 fitness tracker?


  1. On your new Polar A370 watch, tap on Main Menu > Settings > Watch, Time and Date
  2. Select Time:
    1. Time 1 is to set your local time’s format in terms of hours and minutes
    2. Time 2 is to set the time for another time zone

How do I update my Polar A370 fitness band?

Unfortunately, it doesn’t happen automatically, but you do get notified whenever there is a firmware update.

There are two ways:

  1. Mobile:
    If you downloaded the Polar Flow mobile app, then the app will let you know when it’s time to upgrade and will guide you through it.

  2. Computer:
    Otherwise, you can connect your A370 to your laptop with the USB cable when it tells you to update. FlowSync will sync all your data, then ask you if you want to update.

Note that it might take a while (maybe 20 minutes?) for the update to happen. Afterwards, it will restart itself.

That’s when you know if you can start tracking activity like normal again.

Top Alternatives

Next Model UP

polar m200 fit watch range colours

If the NO CHEST STRAP option brought you to the Polar A370, Polar’s other products with wrist-based HR is the M200 (intro level GPS running watch.

Next Model DOWN

polar loop2 product test

That’s an easier question. The next model down is the Polar Loop 2. Fairly similar tracking functions like steps, calories and inactivity alert, but without the built-in HR sensor. The Loop 2 is an attractive and discrete band for those looking to increase everyday activity.

Similar Alternative Fitness Bands

The best alternatives with the closest functionality to the Polar A370 activity tracker would be the FitBit Charge 2 and the Garmin Vivosmart HR.

The Vivosmart HR & Charge 2 feature a barometric pressure sensor that provides stairs climbed feedback not found on the A370. Both provide OFF the WRIST pulse monitoring and 24/7 tracking.

They are ALL very good fitness bands, they all record HR to a reliable and accurate level, they all give an indication Vivosmart HR+f sleep duration & quality and they all motivate you to move throughout the day…

Update Oct 2017 > Garmin have just released their new Garmin Vivosport fitness tracker. Replacing the Vivosmart HR+, the Garmin Vivosport features built-in GPS, wrist based pulse rate, dedicated running functions (auto-lap, pace alerts etc) a full colour display, VO2 max, Stress tests and much more.

CardioCritic have awarded the Garmin Vivosport Best on Test in tracking category and expect it to be one of the best selling fitness trackers. Other solid options include:

  • Garmin Vivosport – voted Best In Class – a sleek, discrete fitness watch with GPS and wrist based HR

  • Garmin Vivosmart 3 – top of the range tracker with VO2 Max, Fitness Age, Stress score and more

  • Garmin Vivosmart HR – replaced by the Vivosmart 3 (above) but still a highly recommended fitness band

  • Fitbit Charge 2 – hugely popular best selling tracker of 2017 and 2018


If you’ve got this far then you’ll know by now that CardioCritic analyzed this Polar A370 very highly. The only feature missing found on other similarly priced fitness trackers is STEPS CLIMBED.

It’s not a feature I really find that useful, but some people may have a reason for wanting it. I certainly wouldn’t allow that one omission put me off buying this 5/5 Star Review Polar A370.

Andrew Wyatt

Andrew Wyatt

Andrew Wyatt from Texas has been the best-selling author in 2014. He was the most appreciated writer in 2015. Different organizations have honored him with different awards and memberships as well. He is a tech shop owner and completed graduation in Electrical Engineering.

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