It's very individual and has a lot to do with inheritance- I'm a hummingbird, I max out at over 200, so the 168 -172 range is mostly in my Zone 3, but some people max out in the 170s. (I'm 34 btw) And it has little to do with how strong you are - a team mate of mine who's zones run about 30 beats lower than mine is stronger than I am, though I am stonger than some others with lower max's than myself.
-oh and if you don't feel comfortable doing a self test then getting one at the gym should be well worth it.




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