It doesn’t and it is only part of the key. Same reasons we don’t use HR for bike training. There is a qualitive difference between the work on the muscles and the CV stress measured simply by the rate of the heart.
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Without a bunch of other context, HR data can be very misleading. 2 huge influencers on HR for me are temp and caffeine usage. Not that those things (and others) couldn’t be incorporated into a model to help inform recovery status inclusive of HR, but HR is far from a simple indicator. I’m not saying HR data (and anything else they can get their hands on) shouldn’t be incorporated into the models they are building, just that the “wheel” for HR isn’t a simple round thing.
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I feel like people dismiss heart rate because things like heat and dehydration can cause fluctuations or variations. In my opinion that is one of the best reasons to use it in training. Your body is reacting to stresses. I try to train “intensity” with pace/power and endurance/“easy” with heart rate. On an “easy” day I want to make sure it is “easy”. There is a time and a place for power, pace and heart rate.
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I think most of the community agree with that. 
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I’m just going into my last week of HV Sus PB so recovery week.
Looking back, and at RLGLs advice, it’s definitely telling me to cut out even easy pace running and swimming, and switch to a masters plan.
@Nate_Pearson @ZackeryWeimer
I’d like to hear an update/more from TR on running swimming RLGL before I do that. I’m a heavy guy so running affects HR disproportionately for me.
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Looking back at my calendar, I had some of my best intensity performances on “yellow” days.
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It is warning you about the future, not necessarily that day.
Try and listen to the update at the start off the latest podcast…
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Anyone else notice the new feature to release with RLGL today, “Training Approach?” A five point scale from Conservative to Aggressive that seems to affect how quickly TR will assign yellow or red days. Strange it wasn’t brought up in the announcement video.
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Last week? 
I’ve left it at the middle default setting
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Whoops! Clearly missed that. You’re on the ball!
