I always recommend the use of a good heart rate monitor when exercising. It is like wearing a speedometer that indicates how hard your body is working.
However not everybody can use them. Here is a recent post I wrote covering this area http://joinjj.com/does-your-health-status-and-medication-effect-your-heart-rate/
If you have any questions regarding the use of heart rate monitors, please comment below and I will try to help you.
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