QAHTAN ABDUL MOHSEN, Zainab. The effect of positive and negative flexibility exercises to develop special strength and effectiveness of 400m youth Hurdlers. International Journal of Psychosocial Rehabilitation, [S. l.], v. 24, n. 1, p. 7747–7751, 2020. DOI: 10.61841/57jyvy28. Disponível em: https://psychosocial.com/PSY/index.php/ijpr/article/view/1159. Acesso em: 9 may. 2025.