IMPROVEMENT OF THE LONG-TERM TRAINING SYSTEM OF VOLLEYBALL PLAYERS BASED ON THE PRINCIPLES OF INDIVIDUALIZATION AND VARIABILITY OF TRAINING LOADS. Wor. Bull.of Phy. Edu. & Spo. Sci. [Internet]. 2025 Dec. 16 [cited 2026 May 1];1(03):70-81. Available from: https://worldbulletin.org/index.php/2/article/view/172