She rides her bicycle.

And then they pick up the oxygen from inside the alveoli or the oxygen diffuses across the membrane of the alveoli, into these capillaries, into these super small tubes.

More importantly, they not only walk far to work, and not only do they cycle to work, but they cycle for work, as you can see here.

I'm probably the only person you'll ever meet who rode his bicycle across the Sahara desert without sunscreen.

Instead, if your friend's idea of recreation is physical activity, bowling, or playing hockey, biking or gardening, if your friends drink a little, but not too much, and they eat right, and they're engaged, and they're trusting and trustworthy, that is going to have the biggest impact over time.

And we said in the last video that you have these capillaries, these pulmonary capillaries that are running all along the side of these alveoli.

More importantly, they not only walk far to work, and not only do they cycle to work, but they cycle for work, as you can see here.

Instead, if your friend's idea of recreation is physical activity, bowling, or playing hockey, biking or gardening, if your friends drink a little, but not too much, and they eat right, and they're engaged, and they're trusting and trustworthy, that is going to have the biggest impact over time.