A kegel is the name of a pelvic floor exercise, named after Dr. Kegel who discovered the exercise in 1948. I call them the invisible exercise, since you can do them when no one else can tell. Kegels are a series of exercises which can help tighten up the pubococcygeal muscles (PC muscles). These originate from your pubic bone, go under your genitals and attach to your tailbone. Both men and women have them.