When exercising women should wear a sports bra for support - Sagging can be induced further by not wearing a sports bra when exercising or running
. A study done by a research team at Portsmouth University in England showed that bouncing (that leads to sagginess) was reduced by almost 40 percent when women wore a regular bra. However, bouncing was reduced by a considerable 78 percent when the proper sports bra was worn while jogging.