Factor in that female participation in sports is increasing every year and athleisure appears to be here to stay , and it's no wonder that from Lululemon to Under Armour to Victoria's Secret , brands are turning their attention to sports bras. Photo: Jenny White/Brittany Holloway-Brown But researchers are still a long way from understanding exactly how breasts move during exercise. Standing in the way of designing the best sports bra possible is millennia of stigma, powerful marketing forces, and good old-fashioned physics. Breasts have no muscle. They sit on top of the pectoral muscles, but breasts themselves are all fat and glands and connective tissue. They're held to the chest by something called Cooper's ligaments, though those ligaments aren't designed to reduce movement. As one study puts it , "the skin appears to provide most of the support for the breast in regards to Some Practical Concepts For Root Aspects In Corset Sewing limiting breast movement." That is to say that there is nothing biological working to stop breasts from moving.
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