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I use a Garmin Vivofit 2. they have newer models including ones with a heart rate monitor but i think this one is perfect. doesnt look too bad, isnt bulky, battery lasts about 10months with active use, waterproof unlike fitbits, tracks your steps and mileage which is useful when on trails to know where youre at based off of distance, and ties into your phone when theres signal available to make pretty accurate mileage and height gained measurements
My only thing is the latch sometimes gives if you pull too hard on it cause it is all rounded. Just have to check every once in a while to make sure its still locked.