Pelvic floor exercises help to strengthen the muscles of the pelvic floor, which come under great strain in pregnancy and childbirth. The pelvic floor consists of layers of muscles that stretch like a supportive hammock from the pubic bone (in front) to the end of the backbone (spine).
If your pelvic floor muscles are weak, you may find that you leak urine when you cough, sneeze or strain. This is quite common, and there is no reason to feel embarrassed. It's known as stress incontinence and it can continue after pregnancy.
You can strengthen these muscles by doing pelvic floor exercises. This helps to reduce or avoid stress incontinence after pregnancy. All pregnant women should do pelvic floor exercises, even if you're young and not suffering from stress incontinence now.