Polar has been on the fitness tracking scene for a while – like 40 years – creating devices for those who take their activity monitoring a little more seriously. The runners and cyclists of this world who want plethora of stats including heart-rate monitoring and GPS tracking to measure achievements and progress in detail are well served by Polar.

The Polar Activity Loop 2 succeeds the original model that first put Polar into more consumer level territory, taking on the likes of Fitbit and Jawbone. The Loop 2 adds smart notifications, bringing it up to speed with its competition, while still serving step-counting and calories burned – without the bombardment of stats you get with higher-end Polar devices.
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https://www.pocket-lint.com/fitness-trackers/reviews/polar/135643-polar-activity-loop-2-review-function-over-form