Thread: Can't get out of Z4
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Old 06-27-17, 01:00 PM
  #47  
SylvainG
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Bikes: Schwinn Miranda 1990, Giant TCX 2 2012

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Originally Posted by ironwood
After reading all this, I still have no idea what z4 is about. Just ride a bike and forget about all these gadgets and figures. Some days I ride ten miles ,other days twenty.
See this

Heart Rate Zones | Masters Athlete
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