Spiky balls are great for feet because they help to release muscle tightness which can contribute to pain. You can use them after a long day of standing when you’re relaxing or watching TV, or even while working at your desk. One way to use a spiky ball is to first roll it beneath the heel for about 30 seconds, then the arch and finally beneath the ball of the foot. Just watch out that the dog doesn’t find it! You can pick up a spiky ball at the clinic for $15.