What are kegel exercises? are they actually effective?

Urinary incontinence: First published in 1948 by arnold kegel, a pelvic floor exercise, more commonly called a kegel exercise, consists of repeatedly contracting and relaxing the muscles that form part of the pelvic floor. When you squeeze your buttock muscles, and hold them squeezed, then relax, repeat, etc, ..You are doing a kegel exercise. They can be effective.