As I have often written, exercise changes the structure and function of the brain.

正如我经常指出的，运动可以改变大脑的结构和功能。

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One of the reasons there has been trouble for some on Twitter is no other written exercise, especially public, has been more like talking.

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Again, volumes of books have been written about various exercise regimens.

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My own letter was written on a single side of paper taken from a school exercise book.

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