I realise that this may sound odd but does anyone know why I feel like the contents of my bottom are going to fall out when I exercise? 
I'm 50 and fairly fit, healthy weight, exercise regularly etc, good muscles, but have a stage 1 rectocel and I'm wondering if it's just that or something else. I was diagnosed 10 years ago and I don't think it's progressed but still, when I exercise, especially aerobically, I feel as if I've got a rounders ball up my bum and it's trying to drop out if that makes sense. I've noticed it more these last few years and sometimes it's worse than others. Sometimes I need to pee half way through my workout too due to feeling suddenly 'full' but at other times its fine.
My core and pelvic floor are fine mostly but sometimes they just feel like they almost fail.
any idea?