“…Therefore, athletic performance should be analysed on the ecological scale, which implies that the performerenvironment coupling is the smallest unit of analysis worth examining to understand sports performance and expertise (Ara ujo & Davids, 2018), otherwise defined as a complex adaptive system (i.e., a self-organising system, continuously regulating its behaviours without being regulated by an external regulator) (Davids, Ara ujo, Seifert, & Orth, 2015;Hendry et al, 2014;Seifert et al, 2017). For example, in rock climbing, we should be encouraged to view movement up the wall as the rolling motion of the body in reference to a surface of a climbing wall, rather than according to a longitudinal axis passing from the head to the feet of the climber (for more details, see Seifert et al, 2015).…”