Gretchen Reynolds said this quote

If you move enough, your muscles change and grow. So does your mind. The brain initiates movement. But it is, in its turn, remade by movement. New cells are born; new vessels sprout. The same process operates body-­wide. No cell in your body is unaffected by motion. Your very DNA is changed.

~ Gretchen Reynolds

There was no girls' cross-country team at our high school, since cross-country courses were two or three miles long, and, at that distance, a girl's uterus could fall out.

~ Gretchen Reynolds