No, not that kind–tennis ball sized ones, hardish and bouncy, perfect for getting to those pressure points under your achy feet.
Roll the ball in little circles–under the arches, around the heels. Move it up and down, like a roller, under the balls of your feet. Push straight down to apply more pressure. Then pick it up and roll it with your hands over the base of your toes.
Essential Life Motto: If it feels good, do it. When it doesn’t, stop.