Kegel balls, also called Ben-Wa balls, are small weighted devices that can help strengthen a woman's vaginal and pelvic floor muscles. The University of Maryland Medical center cites that strong pelvic floor muscles help prevent urinary and fecal incontinence. Many women begin doing kegel exercises without props, then move on to using vaginal balls or cones to increase resistance and make the exercises more challenging. Other women use kegel balls for vaginal stimulation or to increase arousal. There are four basic exercises you can do with