STUDY REGARDING THE EFECTIVENESS OF THE ACTION MEANS USED FOR PERFECTING THE SLIDING TECHNIQUE IN CROSS-COUNTRY SKIING, IN THE JUNIORS II FROM THE VATRA DORNEI SCHOOL SPORTS CLUB. journal [Internet]. 2017 Sep. 1 [cited 2025 Apr. 4];13(2). Available from: https://gymnasium.ub.ro/index.php/journal/article/view/257