Heart rate monitors can be a useful tool during exercise for new and experienced runners and other athletes.
from Well http://well.blogs.nytimes.com/2014/08/15/ask-well-how-do-you-use-a-heart-rate-monitor/
from Well http://well.blogs.nytimes.com/2014/08/15/ask-well-how-do-you-use-a-heart-rate-monitor/
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