All the challenges are based on research findings that show they increase measures of wellbeing. The references are listed at the end of each week in case you would like more information!
"This model aims to explain how and why performing positive activities makes people happier. As illustrated at top, positive activities increase positive emotions, positive thoughts, positive behaviors, and need satisfaction, all of which in turn enhance well-being. Features of positive activities (e.g., dosage and variety) and of the person (e.g., motivation and effort) influence the degree to which the activities improve well-being. An optimal person-activity fit (i.e., the overlap between activity and person features) further predicts increases in well-being. (Lyubomirsky et al, 2013)
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Sin, N.L, Lyubomirsky, S.,(2009). Enhancing well‐being and alleviating depressive symptoms with positive psychology interventions: A practice‐friendly meta‐analysis Journal of clinical psychology 65 (5), 467-487.
Lyubomirsky, S., & Layous, K. (2013). How do simple positive activities increase well-being? Current Directions in Psychological Science, 22, 57-62.
Lyubomirsky, S., King, L., (2005). The benefits of frequent positive affect: Does happiness lead to success? Psychological Bulletin, 131, 803-855.