Once stretched, the ligaments supporting human breasts can never return to their original shape.

Cooper's ligaments, also known as the suspensory ligaments of Cooper, were first described by Sir Astley Cooper in 1840. These thin, fibrous bands of connective tissue run throughout the breast, connecting the deep fascia of the chest wall to the skin. Unlike muscle tissue, which can contract and recover, these ligaments are primarily composed of collagen and lack significant elastic fibers. This structural composition means that once they are elongated beyond their natural limit, the change is permanent.Research conducted by the University of Portsmouth's Research Group in Breast Health has shown that breasts can move up to 15 centimeters during high-impact exercise. This repetitive vertical and lateral movement places immense mechanical stress on the ligaments. Without proper support, the weight of the breast tissue pulls on these delicate fibers, leading to a condition known as ptosis. This process is further accelerated by the natural loss of collagen that occurs as humans age.Studies published in the British Journal of Sports Medicine emphasize that a high-quality sports bra can reduce breast displacement by over 70 percent. This reduction in movement is critical because there is no non-surgical way to shorten a ligament once it has been stretched. While pectoral exercises can strengthen the muscle beneath the breast, they do not affect the ligaments themselves. Consequently, preventative care through mechanical support remains the only effective method for maintaining breast shape over time.