Kegel Exercises for Your Pelvic Muscles, How do pelvic muscles get weak?, Which muscles control my bladder? Thehealthtime.com Kegel Exercises for Your Pelvic Muscles How do pelvic muscles get weak? Pelvic muscles help stop the flow of urine. For women, pregnancy, childbirth and being overweight can weaken the pelvic muscles. For men, prostate surgery can weaken pelvic muscles. Weak pelvic muscles can cause you to leak urine. Fortunately, pelvic muscles are...