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I had a Fitbit One for a year, but kept leaving it clipped onto a bra and tossing it in the washer. The Flex is better for that, but I don't find the wristband to be especially durable. I also don't like the battery life as compared to the One. I'm planning to upgrade to the Force after theirst of the year, because the…
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166 isn't your max heart rate, it's 85% of your max heart rate which is probably a target for your workout. being 5bpm over that shouldn't generally be a major concern, but you could relax the intensity of what you're doing if it causes you concern. a simple formula is 220 - your age = max heart rate. so for a 25 year old,…