“…For example, activities such as counting one's blessings (Chancellor, Layous, & Lyubomirsky, 2015;Emmons & McCullough, 2003;Froh, Sefick, & Emmons, 2008;Seligman, Steen, Park, & Peterson, 2005), writing letters of gratitude Layous, Lee, Choi, & Lyubomirsky, 2013;Layous et al, 2017;Lyubomirsky, Dickerhoof, Boehm, & Sheldon, 2011;Seligman et al, 2005), and performing acts of kindness (Chancellor, Margolis, Jacobs Bao, & Lyubomirsky, 2018;Dunn, Aknin, & Norton, 2008;Layous et al, 2013;Nelson et al, 2015;Nelson, Layous, Cole, & Lyubomirsky, 2016;Sheldon, Boehm, & Lyubomirsky, 2012) have been shown to reliably boost well-being. If administered optimally, positive activity interventions can also build positive psychological resources such as social connections and meaning in life, as well as ameliorate existing maladaptive symptoms such as anxiety and rumination (Layous, Chancellor, & Lyubomirsky, 2014;Seligman, Rashid, & Parks, 2006;Seligman et al, 2005;Shin & Lyubomirsky, 2016;Sin & Lyubomirsky, 2009;Taylor, Lyubomirsky, & Stein, 2017).…”