Hi Mirko ,

You are right , if it says you should do 90-100% of the aerobic threshold , it means you are doing the base training on zone 2 where you build aerobic capacity .
Since you are preparing for ultras , most of your training should be under the anaerobic threshold, you should sustain efforts from longer periods without the presence of acid lactic .

I hope I answered you questions

Cheers ,

Pedro Carvalho

Hi Mirko ,

I think it would be good for you do a phone consultation, to better understand your problem .
Your aerobic threshold should be your top of zone 2 , I am quite sure that your values should be :
AeT = 145
Ant = 160
And so you will be working in between 132-145 beats per min ,being that your zone 2

I hope it helped …

Cheers ,

Pedro Carvalho

If you have more questions , you can write me directly at pedro@uphillathlete.com

Nullkru, one other thing to keep in mind is that the plans are written for general use, and most people are aerobically deficient.