Specific Mental Aptitude Reaction Training (SMART) refers to a type of training that aims to improve a person's reaction time and cognitive skills through specific mental exercises and drills. This type of training is often used in sports, military and emergency services, and in some cases, by people looking to improve their cognitive abilities in their personal or professional life. The focus of SMART is to train the brain to react quickly and effectively to a stimulus, leading to improved overall performance in tasks that require quick thinking and reaction time.