Exercise-induced breast motion causes repetitive strain on Cooper’s ligaments — the connective tissues that support the breast structure. This leads to microtrauma, inflammation, and over time, ligament laxity and ptosis (sagging). A sports bra minimizes mechanical stress, stabilizes breast tissue, and prevents pathologic changes. It’s not just comfort — it’s anatomical protection. Literature references: Norris et al. (2020) – University of Portsmouth