“…Students' interpersonal differences in motivation may relate to variation in their physical activity levels during the PE course (Cox, Smith & Williams, 2008;Ntoumanis, 2001). In addition, motivation may also vary from one class to another as a function of factors such as the gender distribution within the class (Lyu & Gill, 2011;Olafson, 2002), the topic of the lesson (Bevans, Fitzpatrick, Sanchez, & Forrest, 2010;Hassandra, Goudas, & Chroni, 2003), the structure of the class environment (Papaioannou, Marsh, & Theodorakis, 2004), and the style of the teacher (Mouratidis, Vansteenkiste, Lens, & Sideridis, 2011). Although it is reasonable to assume that between-class differences in motivation are associated with class-to-class variation in physical activity and engagement-with some classes being more physically active and engaged than others-to our knowledge, no study in the PE context has directly examined this issue.…”