Garmin Recommended Running Workouts - Heart Rate

I asked Garmin about this via DM on twitter. Their response is below. 

“The suggested workouts don't necessarily use that data directly. The suggested workouts use training status, training load & load focus, Vo2 Max, Recovery Time, Sleep Data, and the profile of recently performed workouts (so this is where that would come into play). We do have a bit more information about the daily suggested workouts here: http://ms.spr.ly/60195SQY1

Enjoy your week!
»CP”

brwhittle said:

My Zone 1  heart rate range on my device is 138-145 bpm.  My maxi is 180.

How did you determine your HR max ?
Your zones seem to be wrong. If your HR max is 180, your zone 1  (warm up) cannot be 138-145.

Hi, it is calculated based on max hr and resting hr. My current resting hr is 52.,max is 180. So Z1 would be 52+67%(180-52). gives 137.8.

Garmin connect gives you this option (%HRR).

What would you suggest Z1 should be? 

Thanks, I had a look. 

I tested the by changing my heart rate, made no difference to the recommendation. 

I've been using the watch for about a week recommendation may be more realistic once it has more data. 

If you have chest strap, change your HR Zones to be set %LTHR and do LTHR test.
It is more reliable and will adjust to your condition automatically.

6798117 said:

What would you suggest Z1 should be? 

I suggest setting the HR Zones based on %HRmax. Zone 1 50-59% = 90-106

Interesting. My LTHR is 163, using that my HR zones comes out about the same. I'll do the guided test and let is adjust automatically.

Thanks. For me that would be too low, I could walk in that range, but not any form of running.

Zone 1 is warm up. How long have you been running ? How much experience do you have with running ?

Been running for many, many years.  Took a break, did some cycling and now running again.