Originally Posted by
PeteHski
Problem is that could be miles out for any individual. For me it would indicate a max HR of 165 bpm, while my real max is actually 193 bpm.
There's only one reliable way to set your max HR and that is to go out and hit it!
Absolutely true. That's how I know my real max is much, much higher & I can sustain above the 220-age for an more than an hour and still be conversational & not winded.
I brought it up because at first glance the OP's zones seem to be set low/improperly set for a healthy someone who is 35. But graph pattern of bars look consistent with a dedicated structured training ride. Since it wasn't, it offers a clue as to his actual cardiovascular fitness.
My guess is the OP is a fairly new first or maybe second year cyclist discovering fitness is not a thing you do but a thing you are.