as someone who has a mild case of prolapse (bladder and anus), yes, do you kegels!
bad news is, i did them all the time when pregnant and i still have issues. but, i also had to push a big girl out for over 3 hours, so i think that would = damage. but, surprisingly, no hemmroids. thank god...who knows that the damage would have been without the kegels?
and yes, running is bad for prolapse. gravity. like wrinkles. i was a huge runner. sigh!
i actually went to a physical therapist for my vagina post-birth to work on my entire pelvic floor. it's not just your kegel muscles that hold it all in, but your abs, your inner/outer thighs, and your butt muscles. sigh...that's a lot of working out!
so, sadly ladies, you gotta keep the whole package in shape!