Give women the support they need
Your bust moves up and down with each stride you take. It happens whether you have modest curves or more ample proportions, although bigger bust sizes will experience a greater degree of bouncing. This can be uncomfortable and painful, especially when you wear regular bras with underwiring which can poke the breast and damage tissue. Prolonged use of these bras while running can cause irreversible damage, decreasing the firmness and support structure of the breasts, and even causing sagging and deformation.
Maybe it's time to reconsider sport bras.