Trigger points are tiny knots that develop in a muscle when it is injured or overworked. Pressure on these points can send referred pain to other specific parts of the body. Commonly a cause of most joint pain, Trigger points are also know to cause headaches, neck pain, lower back pain, tennis elbow and carpal tunnel syndrome. The Physio MAX has be specifically designed to relieve the muscular aches and pains associated with these areas. It can also assist with the restoration of motion to joints following injury. Because it is larger than a standard Pocket Physio it is most useful for deep muscle trigger release particularly Piriformus and Glute Medius and Minimus. This size is recommended for athletes.