Don't push? New info for athletic women preparing to give birth

Hi all, I just learned from a dear friend who had four babies that pushing during labor may cause traumatic injury to the pelvic floor if you are athletic. She suffers from urinary incontinence. Apparently when she went in, the doctor or therapist said her pelvic floor was weak like she'd suffered a serious traumatic injury. But nope, longterm fitness addict and very athletic woman. Apparently if you are already strong, pushing can seriously damage those muscles. Athletic women just can let their bodies push baby out. Comment if you have heard this before. I'd never learned so thought I'd share!