When it comes to running there is a significant difference between different heart rate zones. Try different once to see if one works better than others. http:/

When it comes to running there is a significant difference between different heart rate zones. Try different once to see if one works better than others. http://anerleybc.org/heart-rate-zones/ http://anerleybc.org/heart-rate-zones/ Also, running can be replaced with cycling as a less damaging cardio workout. Or swimming if possible.