New research (coincidentally by a sports bra manufacturer) says that women should wear a sports bra (really?) when they’re jogging or exercising so as not to develop “saggy” breasts.

Apparently breasts bounce in a figure-of-8 rotation, placing stress on fragile tissue ligaments, causing them to stretch. Shockingly, the study suggested that as a woman runs a mile, her breasts bounced a total of 135 metres. This seems to be an average - whether you get more bounce per ounce isn’t discussed. Further research is obviously going to have to take place, as long as there’s funding… and men who want to look at bouncing breasts all day.

Read the full story here . Never ones to miss a trick, our pals at the BBC have included a gratuitous (but nice) picture of Anna Kournikova’s cleavage too. Although, judging by the pic, she doesn’t have much to worry about in the sag department.