This article from Diets In Review.com explains some of the barriers female athlete may face when attempting an exercise program. Excessive breast tissue movement during exercise is uncomfortable and can be embarrassing for some female athletes. This can cause some women to avoid physical activity, which can lead to a sedentary lifestyle. One of the first steps any female athlete should take is getting the right equipment and that includes a proper fitting sports bra. Any good running store will have a wide variety of sports bras to accommodate most female athletes.
My favorite store is Everyday Athlete in Juanita. They carry several brands and have women on staff to help you with your selection.
In Health, Dr. Suzie Shay