How lung capacity increases when doing consistent cardio and what happens anatomically?

Question

How lung capacity increases when doing consistent cardio and what happens anatomically?

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Answer 1

The first step i haven’t seen anyone mention yet is that in normal life we don’t need to use our entire lung capacity. So, being the lazy creatures we are, a lot of our lung capacity ends up functionally unused.

When you start exercising and needing that lung capacity, your lungs need a bit of time get used to use again, but when they do that’s your first big bump in improvement.

Bar that, lungs are only ever the bottleneck in specific cases, for the vast majority of people your heart is the bottleneck.