A team of researchers from Portsmouth University claim that 9.5 million women in the UK could be irreversibly damaging their breasts by practicing sport and not wearing a proper sports bra.The study shows that as a woman jogs a mile, her breasts bounce in a 3D figure of eight for over 135m, a movement the team points out strains fragile tissues and ligaments and eventually leads to sagging breasts.Researcher Dr Joanne Scurr said "People rightly spend time and effort to get the right footwear for exercise and it is equally important to wear the correct sports bra.” The report recommends wearing a sports bra manufactured by the studies sponsor.