When a woman is playing sports, her breasts experience a bi-directional vibration resembling the number "8". The degree of this vibration varies according to the type of sport she is playing. Ordinary underwear cannot prevent her breasts from shaking. Playing sports without protection-enhanced underwear may cause permanent damage to her chest ligament. In serious cases, it may even cause her breast tissue to tear and loosen and her breasts to droop permanently.
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