This month’s Discover magazine has a fun article on efforts to design a better bra which might give pause to those who you who are wishing for a pair of your own:

A pair of D-cup breasts weighs between 15 and 23 pounds—the equivalent of carrying around two small turkeys. The larger the breasts, the more they move and the greater the discomfort. In one study, 56 percent of women suffered from breast pain when jogging.

Eek!
To best support breasts, a designer has to understand how they move. To that end, McGhee’s team in Australia, headed by biomechanist Julie Steele, tags women with light-emitting diodes and asks them to run on treadmills….Breasts move in a sinusoidal pattern, Steele has found, and they move a lot. Small breasts can move more than three inches vertically during a jog, and large breasts sometimes leave their bras entirely. “We have videos of women who, particularly if the cup is too low, spill all over the top,” Steele says.

Just keep that in mind the next time you complain about your breast forms.