"Breasts are mostly composed of fatty tissue and are supported mainly by skin and fragile ligaments called Coopers' ligaments. Because these are not elastic, during repetitive or high impact sport the breasts bounce and pull on the ligaments, forcing them to stretch.
Once these ligaments have stretched they stay this way. The result is every woman's nightmare - sagging breasts.Going without the correct support can also cause breast pain and upper back and shoulder problems.
Running without any bra at all causes the average woman's breasts to move up and down by 8.5cm. Wearing an ordinary bra reduces this by 32 per cent. A sports bra reduces this by at least another 20 per cent"
Read more: http://www.dailymail.co.uk/health/article-35692/Why-need-sports-bra.html#ixzz1dvWfWmfH
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