“…Cross-sectional studies have consistently shown that self-efficacy is a mediating variable between social support and PA (Motl, Dishman, Saunders, Dowda, & Pate, 2007; Peterson, Lawman, Wilson, Fairchild, & Van Horn, 2013; Wing, Bélanger, & Brunet, 2016). That is, social support may enhance an individual’s self-efficacy to overcome barriers to PA, and this enhanced self-efficacy is associated with greater PA. Other studies have highlighted that lack of time, lack of interest and enjoyment may also mediate the relationship between social support and PA (Shen et al, 2016; Verloigne et al, 2014; Wing et al, 2016), but these findings are based on only three studies. This suggests that a lack of social support may lead to young people being uninterested in PA and perceive barriers, such as lack of time, to PA.…”