Active Isolated Stretching: Aaron Mattes Method-Active Isolated Stretching (AIS) is one of the methods of stretching most used by today's athletes, massage therapists, personal/athletic trainers, and professionals. Active Isolated Stretching allows the body to repair itself and also to prepare for daily activity. The Active Isolated Stretching technique involves the method of holding each stretch for only two seconds. This method of stretching is also known to work with the body's natural physiological makeup to improve circulation and increase the elasticity of muscle joints and fascia. There are several ways of learning about Active Isolated Stretching (AIS).