Obstetricians advise their patients to begin a Kegel regimen before giving birth to allow for a smoother delivery and to prevent weakening after childbirth, which can lead to incontinence and uterine prolapse. The way to do a proper Kegel exercise is to contract the muscles that control the flow of urine and hold the contraction for three seconds, then relax for three seconds. Repeat 10-15 times each day. If you feel your stomach or buttock muscles contract, then you're not doing it correctly - attempt to isolate only the muscles that control the starting and stopping of urine. Your doctor can help you do them the right way so that you reap all the benefits.