Kegel exercises are great for strengthening the muscles of the pelvic floor, which help keep your uterus, bladder, small intestine, and rectum in place. When you sit on the toilet and suddenly have to halt the flow of urine, the muscles in your pelvic floor kick in. If you want to keep urine from leaking, stop gas or poop from coming out on its own, and even improve your orgasm, you should work on strengthening these muscles.