Training Plan requested HR Zone

Hello,

i have a question regarding the proposed HR Zone in the Training plan. Which is the method used for this?

for example training plan says: easy run - zone 2

if I use % of HF Max my zone 2 is 114-133

if I use % of HR Reserve my zone 2 is 138 - 151

if I use % of lactate treshold (158) my zone 2 is 126 - 141

all these calculation use the default Garmin percentage zones.

what is the right choice if I want to use a Garmin training plan.

many thanks for your help

kr Florian
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