Breath out or exhale while you suck up your pelvic floor muscle
Pull the Pelvic floor muscle up while you exhale. or get it repaired
it is the Kegel muscle. it controls when you urinate
If you haven't given birth yet then this isn't the answer for you, since the pelvic floor is forced to stretch while in labor. This still answers the question no matter how long ago you gave birth....
levator ani