“…Although some recent UK studies have considered health-related fitness measures and socio-economic status in statistical analyses (Brophy, Rees, Knox, Baker, & Thomas, 2012;Charlton et al, 2014;Nevill, Duncan, Lahart, & Sandercock, 2017;Noonan, Boddy, Knowles, & Fairclough, 2016, 2017, there were inherent limitations. Specifically, the predominant focus was not comparing multiple fitness measures across socio-economic status, and the variation in health-related fitness variables included in these studies limits inter-study comparisons (Nevill et al, 2017;Noonan et al, 2016Noonan et al, , 2017. Additionally, these studies neglected to include any measure of the muscular strength component of physical fitness (Brophy et al, 2012;Charlton et al, 2014;Nevill et al, 2017;Noonan et al, 2016Noonan et al, , 2017.…”