“…Few studies have analyzed hamstring extensibility in dancers (Agopyan, 2018;Chatfield et al, 1990;Claessens et al, 1987;Gómez-Lozano et al, 2012;Koutedakis et al, 2007;Martínez et al, 2014;Oreb et al, 2006;Steinberg et al, 2006). Furthermore, they have usually included a small sample size (with only one study including more than 35 participants in the dance group) (Steinberg et al, 2006); an absence of a control group (Agopyan, 2018;Claessens et al, 1987;Koutedakis et al, 2007;Oreb et al, 2006), or separated groups according to each dance style (Steinberg et al, 2006), although the different dance styles have different techniques which can influence hamstring extensibility (Forczek, Baena-Chicón & Vargas-Macías, 2017;Grant, 2012;Villanueva, 1995); and an absence of homogeneity in the age and the level of the dancers, although these factors can affect hamstring extensibility (Conesa-Ros, Martínez-Gallego & Santonja, 2016).…”