Your pelvic floor muscle (PFM) has a very important job, it helps hold up all the other stuff you have going on inside — your uterus, bladder, bowel and other bits. When your PFM sags, those bits inside can feel like they are dragging down. This is called prolapse.
Prolapse can happen if you ignore small leaks, as a result of a tough pregnancy or birth, or if you do loads of heavy lifting. Starting your pelvic floor strengthening exercises when you're young can help to prevent it and other bladder problems.