The PP exercises used in this study were selected based on their superior performance in our pre-pilot research and others' work: Gratitude for Positive Events (Week 1), Using personal strengths (Week 2), Gratitude letter/Expressions of Gratitude (Week 3), Capitalizing on Positive Events (Week 4), Remembering past success/Remembering daily successes (Week 5), Enjoyable and meaningful activities (Week 6), Humor in everyday life (Week 7), and Performing acts of kindness & Next Steps (Week 8). Participants in conditions 5-8 will have three additional bi-weekly "maintaining your gains" sessions (week 10, 12, and 14) in order to identify favorite exercises, explore the skills derived from doing the exercises, and learn how to integrate the exercises in their daily lives.