This study aims at investigating the Functional Training Effectiveness in Developing Offensive and Defensive Skills for Volleyball Players, The experimental approach with the experimental design was used on one experimental group with the (pre-post) measurement method. The Research sample was selected intentionally, represented by 12 volleyball players (Faqous Sports Club section (B) team, Sharkia) 2020/2021 season, The proposed training program was applied using functional training for ten (10) training weeks with three (3) training units per week, The physical variables under study (explosive power - agility - coordination – accuracy - Speed - Endurance) and the skills variable was offensive and defensive skills (spike – spike serve – block –defense – receiving serve). Statistical treatment included (mathematical mean, standard deviation, correlation coefficient, T-test). Study Results showed statistically significant differences at the level of 0.05 between (pre-post) tests favoring post-tests in both physical and skillful tests - under study - attributed by the researcher to using functional training within the proposed training program. The researcher recommends that there is a necessary need to be directed towards using functional training in volleyball training programs.