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Comment by umvi | Hacker News Reader

That's like 90 minutes of exercise a day if you take zero rest days... Not happening for most people. I think even marathon training requires less than 90 minutes a day on average.

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Moderate is not vigorous. They mean being active and walking, etc.

The imprecise language in these studies often means people can interpret them in whatever way they want.

This study defines moderate as "brisk" walking, suggesting that it's not just walking.

Athletes live in their own bubble where "vigorous" means "maximal".

Right. It is a weakness and makes the meta analyses super important. I can't see all but trained athletes doing even low zone cardio for that much time. But I can see an active person walking, moving around, 12K steps, with a couple hours of genuine workouts / wk hitting that threshold. That matches with how I understand the rest of the studies on this better as well.

The easiest thing for people to do if they aren't confident about their level of stress (moderate vs vigorous vs maximal) is to wear a smart watch with a HR monitor. They aren't perfect (chest straps better yada yada) but you can see your HR zones and if you are in Z1 you are moderate, Z2/3 vigorous.

The language isn't that precise because a trained marathoner is doing 7 minute miles for two hours at 50% of the populations resting heart rate.

I've got multiple wearables and they all seem to agree that normal walking does nothing for me. Barely increases my heart rate, not even Z1. Nor does "doing chores" which seems even more nebulous. But that's just a data point of one.

I skimmed the study rather than the article about it and I don't see them define it at all. They just had a machine learning model take accelerometer data and classified it into "sleep, sedentary behaviour, light physical activity and MVPA". Whether any form of walking counts as light or moderate in this classification is really anyone's guess

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