08/26/2026
I always thought of cardio as being mostly about the heart and lungs.
Then I learned more about VO₂ max.
Turns out, there's quite a team involved.
Your lungs have to bring oxygen in.
Your heart and blood vessels have to deliver it.
Your muscles have to receive it.
And your cells have to put that oxygen to work.
So VO₂ max isn't really a measurement of just one part of you.
It's more like a snapshot of how well this whole system works together during demanding activity.
I think that's what makes it so interesting.
Our bodies are doing incredibly complicated things every time we take a brisk walk or climb a flight of stairs and most of the time, we don't even think about it.