How a well-fitted sports bra can reduce breast pain Movement of a woman’s breasts during exercise can range from 4cm during a walk to 15cm when running, researchers have found. This multi-directional movement can cause breast pain, which affects one in three women, according to a University of Portsmouth study. Not only can exercising with poorly supported breasts cause pain and sagging, it can cause embarrassment and put women off physical activity

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How a well-fitted sports bra can reduce breast pain