Exercises that involve contracting and briefly holding the pelvic floor muscles are referred to as:

The correct term for exercises that involve contracting and briefly holding the pelvic floor muscles is Kegels. This type of exercise is specifically designed to strengthen the pelvic floor muscles, which support the bladder, uterus, and rectum. Kegel exercises are particularly beneficial for individuals experiencing urinary incontinence, pelvic organ prolapse, or those looking to enhance sexual health.

The other terms provided do not relate to pelvic floor muscle exercises. Dialysis refers to a medical procedure that filters waste products from the blood in individuals whose kidneys are not functioning properly. Calyces are the structures in the kidney that collect urine. Crunches are a type of abdominal exercise designed to strengthen the core muscles. By understanding the unique purpose of Kegel exercises, one can appreciate their importance in maintaining pelvic health and function.