Ltpgtltstronggttarget stubborn back aches with a set of two 66fit 8cm spiky massage ballsampnbsp hardltstronggtltpgtr ltpgtthe 8cm hard spiky massage balls are incredibly firm making them ideal to treat stubborn back aches deep muscular tension and other areas of cramped sore musclesltpgtr ltpgtapplying a firm steady pressure roll the 66fit 8cm spiky balls over the affected area using a circular or rocking motionltpgtr ltpgtalternatively place the