| Re: resting heart rate
The better shape you are in the lower it can go, it is simply an indication of the strength of your heart. I read somewhere that the stronger it is, the more blood and oxygen it can pump with each beat, hence the fewer beats required per minute. I don't know if there is unhealthily low heart rate, but if your body wasn't getting enough oxygen and blood flow there would be indications that you were not healthy.
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