Pelvic organ prolapse is a problem experienced by women where a bulge comes down in the vagina, and may even drop down outside the vagina. The bulge in the vagina is caused by other organs moving down from their normal position in the pelvis and pushing into the vagina. This is a very common problem and many women who have given birth will have a very mild bulge which does not cause them symptoms. Women can however experience a variety of pelvic, bladder, bowel and sexual symptoms which impact on daily life. No research studies have properly examined whether or not exercises can prevent prolapse. This study aims to explore whether exercises taught by a physiotherapist can prevent women developing a prolapse which requires them to have treatment.