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. gsjesh [Internet]. 2017 Sep. 1 [cited 2025 Oct. 2];13(2). Available from: https://gymnasium.ub.ro/journal/article/view/257