Exercise is interesting in terms of its effects on the brain because it works in about four or five different ways. Uh, one of the most obvious ways is blood flow. And so if you, uh, get your heart working, your brain's going to be filled with oxygen-rich blood and nutrients. So that's the main way that we thought it would help. The other way that's sort of interesting, uh, is it's been thought that exercise produces, uh, new neurons. And so exercise induces the production of growth factors, one called BDNF, and it actually stimulates the production of new brain cells. Now, when I was in school 20 years ago, we were told, you can't get any new brain cells. So when you're born, that's your lot. You're not going to make any more. But more recently, we found that exercise, uh, is a really good way of stimulating brain cell production. And some of these are functional. And so, um, just this notion that something that you can do can generate new brain cell...
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