Those diagrams use the simplest most general calculations and are therefore not that accurate. Honestly, forget the equations and pay attention to how you feel and how hard your breathing.
A good rule of thumb, you want to be at a point where you can just speak a sentence without stopping for a breath. This is probably a good instensity for you.
Honestly, don't worry about what the best intensity level is yet. The important thing is to just get into a routine of exercising.
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