Muscle Massage Balls are amazing for deep tissue muscle massage, hard massage balls relieve pain and soreness in the hardest body tissues on the neck and jaw, shoulders, hips, forearms, back, legs, buttocks, hands, knees and feet. It stimulates blood circulation while rolling, which can increase mobility and help recover faster from workouts or injuries. It can be carried around in a gym bag, backpack and massaged anytime, anywhere.