“…Some PPIs have been centred on single aspects, such as strengths, optimistic views of oneself, gratitude, or savouring positive events. These interventions showed increases in well‐being (Bolier et al, 2013; Proyer et al, 2016b), decreases in depressive symptoms (Bolier et al, 2013; Proyer et al, 2016b; Seligman, Steen, Park, & Peterson, 2005), and increases in PA (Emmons & McCullough, 2003; Sheldon & Lyubomirsky, 2006). Other PPIs have several components (Moskowitz et al, 2012; Proyer et al, 2016a; Roepke et al, 2015), and findings have highlighted decreases in depression (Roepke et al, 2015) and NA (Moskowitz et al, 2012) and increases in life satisfaction (Roepke et al, 2015) and PA (Moskowitz et al, 2012; Proyer et al, 2016a).…”