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onyerbike
VO2max is about getting lots of O2 in yer ASAP so there is a school of thought which says you just need to be breathing as hard as you can for as long as you can and short intervals and short rests can do that.
There was a session I saw that made you do a 1 min effort at 30 sec pace to get HR way up then 30/30 for as long as you can manage. They tested someone whose HR stayed in VO2 zone for an hour doing this.