Originally Posted by
ancker
So takeaway is that me, who probably doesn't have a VO2max in the 60s let alone mid-upper, still has a lot to gain from HIIT?
Whether you've got something to gain from HIIT is not a function of your absolute vo2max, but a function of how well trained you are relative to yourself. If you're getting off the couch after some time off, you'll gain something aerobically and anaerobically. After a few months of training, aerobic gains are more difficult to come by and anaerobic gains might be easier, depending on the training you've been doing.