The heart rate monitor isn't built in because the 630 possesses the ability to give advanced running dynamic readings that need the chest strap to attain. Look into the garmin 235 it has wrist HR ability. I like to run a lot and use the features to help me get better
Just doing a search on fitness trackers on this site and stumbled across this thread. I just got a Garmin 630 and love it for tracking steps and the GPS for my running activities.
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