Active Isolated Stretching: The Mattes Method centers on physiological principles of specific muscle lengthening, increased circulation & oxygen to the tissues, together with lengthening of the superficial & deep fascia. Active Isolated Stretching (AIS) is one of the methods of stretching most used by today’s athletes, massage therapists, personal/athletic trainers & professionals. AIS allows the body to repair itself & also to prepare for daily activity. The Active Isolated Stretching technique involves the method of holding each stretch for less than two seconds. This method of stretching is also known to work with the body’s natural physiological makeup to improve circulation & increase the elasticity of muscles, joints & fascia.