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There’s also a fitness test built into the M430, and it’s not what you might expect. Instead of having you exercise and measuring your fitness based on your performance, Polar’s Fitness Test asks you to lie down and relax. Confused? Don’t be — it’s measuring your body’s ability to transport oxygen in your blood, with a higher VO2 Max representing a higher level of aerobic fitness. Polar recommends testing every month or so to see your progress. Bizarrely, for a test that just involves lying down and relaxing, it’s very easy to fail. We found it was tripped up

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