Mental fitness refers to one's capacity for self-determination, autonomy, competence, and connection with others. Maintaining mental fitness helps protect against Alzheimer's disease and dementia by promoting neuroplasticity. Research shows that mental decline is not inevitable with age and that challenging the brain through exercises can help maintain abilities. Positive psychology also aims to investigate traits like optimism and perseverance that allow people to flourish. Mental fitness exercises the brain in areas of memory, attention, problem-solving, and concentration.