Hi, I just purchased the first ultra trail running plan and am a bit confused on the recovery runs. It says to run at 80% of your Aerobic Threshold (AeT). I attempted a heart rate drift test but I probably started too low as the avg HR in the first 30 min was 148 and then was 146 in the second HR. Generally speaking I think that adding 5-10 seconds to it may be an easy way to estimate my AeT without having to redo the test. If 158 ish is my AeT then 80% of it would be about 126. I am not able to run with this HR as my HR would be higher. If I walk briskly it would be able 105-115. Am I supposed to then walk all these recovery runs? I’m worried that I won’t get enough running mileage if I walk all of these recovery runs. Thanks so much!