Eleven (19%) women in the pelvic floor muscle training group improved 1 Pelvic Organ Prolapse Quantification System stage vs 4 (8%) controls (P = .035). Compared with controls, the pelvic floor muscle training group elevated the bladder (difference: 3.0 mm; 95% confidence interval, 1.5-4.4; P<.001) and rectum (5.5 mm; 95% confidence interval, 1.4-7.3; P = .022) and reduced frequency and bother of symptoms compared with controls.