|  Subject: What are the HR Training ZonesCan someone describe the basics of HR Zones for a newbie to HR Training?  My understanding is that the most commonly used are:  
Z1 Long Slow Zone 50-70%   
Z2 Endurance   70-75%  
Z4 Tempo/Threshold  80-90%  
Z5 Interval 90-95% 
  
Where the formula for say 75% is:    (MHR - RHR ) * .75 + RHR  
so for example using an estimate of 186 as my MHR and 63 for RHR i would have  
75% = 155bpm 
  
is the formula correct?  
are the 'zones' correct  
how does a newbie use this in training?  Z2 80% of the time and Z4 the rest of the time with a little Z5 mixed into the Z4 sessions? 
  
I have been searching this stuff and have found lots of bits and pieces but i am trying to put it together so i can actually use it. 
  
Thanks 
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