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4-minute HIIT run (30s full/5s walk, repeat) makes you vomit and not feel your legs. 15 minutes of HIIT 5-times a week is a wishful thinking. It's not your typical "vigorous" activity. At my athletic very best I could at most chain 3 HIITs in a row and be destroyed for a few days.

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Fair enough, I don't think it changes my the conclusion though.

On that basis, I would say that someone whose entire exercise regime is doing HIIT a few times a week for 8 minutes (24 minutes in total) is not going to be hitting the 6x multipler required for an equivalent of regular 150 minutes of exercise.

Look up Tabata intervals, used to train speed-skating Olympians.

If that is the entirety of their training regime, I will simultaneously be amazed and change my opinion.

However, I still maintain that if someone is _only_ doing 8 minutes of HIIT 3x times a week, it is not equivalent of a getting 150 minutes of regular exercise per week.

Without further context, it's impossible to comment further.

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