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Walking up a flight of stairs briskly is way above VO2 max for the vast majority of people, yet doesn't feel "extreme"

> for the vast majority of people

..In the states. Ask people from Amsterdam or Berlin about running out of breath from stairs.

I even remember seeing a study that claimed that people who lived in higher floors with no elevator had in average better cardiovascular health, an easy peasy way to nudge people into the right direction.

I am going to work by bike, and in the beginning, I could still get to zone 2. Now this is really hard to achieve. It becomes really hard to push yourself enough.

No, I mean in general. You wouldn't have the capacity to walk up 30 flights quickly, partly because you're way over VO2 max, partly because you're way into the anaerobic energy supply to make up for the deficit.

But I totally agree on the second point, starting in the the 4th floor was a bit hard in the beginning for me too

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