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Only one running watch brand admits its VO2 Max and recovery estimates aren't perfect

Polar lets you test your fitness level, muscular recovery, and sleep recovery manually, instead of blindly trusting its algorithm.

Blame my inability to sleep soundly while wearing a smartwatch or the fact that this job makes me switch watches every few weeks, but it's difficult for me to sustain interest in a new product long enough to take advantage of these features or remember to seek out the information once it's finally ready. (Image credit: Michael Hicks / Android Central)Polar isn't so different from these other fitness watch brands in that it'll also measure your VO2 Max, nightly recharge, and other data passively over time. The Polar Vantage V3 and Garmin Forerunner 965 (Image credit: Michael Hicks / Android Central)Whichever smartwatch brand you buy, you must trust its algorithm, with no way to tweak the numbers or peek behind the curtain.

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