Dr. Karl Knopf provides new insights on the link between a positive attitude and general health. He cites a recent study showing that positive people are less likely to become frail and that optimism can be learned. He jokingly suggests that perhaps everyone should get a dose of B+ blood. Mary Ann Wilson, RN and Lori McCormick, PT, approach this episode with a light-hearted workout that is guaranteed to leave you with a smile on your face.