Exercise And Correct Bra Size
Believe it or not, the University of Portsmouth in the UK has a breast biomechanics team and they have been studying the movement of breasts during exercise. As it turns out the breasts move quite a bit in all directions independent of the body, sort of like a figure eight.
Sports bras, tend to only cut down the vertical movement but not the other directions so the breasts are constantly being pulled and the delicate and important ligaments are being stretched. Your breasts have a main ligament and once it gets stretched is does not go back, this causes the breast to sag.
What's even worse is that those sports bras that look like half tops do not offer nearly the support that's needed and that's what most women think is appropriate support for exercise. In addition they found that almost all women were wearing the wrong size bra.
Many large breasted women opt for reductions because of shoulder and back aches, because their shoulders are bearing the weight of the breast instead of their chest muscles. This again is the result of an ill fitted bra.