Hip flexibility is the main determinant of the back-saver sit-and-reach test in adolescents - Chillón, P; Castro-Piñero, J; Ruiz, J R; Soto, V M; Carbonell-Baeza, A; Dafos, J; Vicente-Rodríguez, G; Castillo, M J; Ortega, F B (J Sports Sci, 2010)