Vo2Max intervals erg as written or resistance and hammer

Can we talk a bit more about this part of it. I see now it was not clear in my question but this was more what I was hoping to understand. If i use erg i am going to be locked into the 120% or whatever. For plenty of workouts that is too easy, but if i turn up the % the rests are not rest. I was trying to get a feel for how many people ignore the % for these types of intervals and just go as hard as they think they can for a given time and number of sets.

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