ROLE OF THE MENTAL REPRESENTATION IN ENHANCING MOTOR LEARNING AND PERFORMING GYMNASTIC ELEMENT. - Wali-Menzli, Sameh; Hammoudi-Nassib, Sarra; Ismail, Souhaila; Hammoudi, Sabra Riahi; Hamrouni, Ines Knani; Jarraya, Mohamed (Science of Gymnastics Journal, 2019)