Our ancestors perceived that for the purposes of combat or sport, the presence of breasts put women at a considerable disadvantage.
The sports bra came too late for the Amazons, and even today it has limitations for women who choose to run hard for long distances.
In a survey of 1397 female runners in the 2012 London marathon, 32% of participants reported having mastalgia. The breast pain was significantly related to cup size and was greater during vigorous than moderate physical activity .
Source: British Journal of Sports Medicine 2013, doi:10.1136/bjsports-2013-092175.
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