Breasts, it turns out, can move about 15 centimeters during a run. That's quite a bit of movement, particularly for the more generously endowed.
So, what to do about the phenomenon known as "runner's boob"?
Rose George, writing at the Guardian newspaper of London, attributes at least part of the problem to women who regard crop-top outfits as though they were a substitute for a sturdy bra. And so, she says she's tempted to say out loud when she sees such a woman on a run, "For God's sake, get a better sports bra."