Here is a link to a calculator for HR zones
http://www.fitzones.com/members/Fitn...rate_zones.asp
its very important to also use rate of preceived exertion, IE how it feels, because HR's can vary from day to day...
http://www.smccd.net/accounts/mcgill/RPE.html
or talk test, so the harder it gets, the harder it is to talk...
once you get used to this, you will start to notice breathing changes. Physiologically, your breathing rates will adjust BEFORE you sense burning in the legs. So its good to get a handle on what the breathing is for various intensities.



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