The research aimed to identify the effect of using the electronically supported generative learning strategy on mental flexibility and the level of performance of the skill of defending the stadium (defending the stadium with two hands from standing and movement - defending the stadium with one hand from below from standing) in volleyball, and the researcher used the experimental method on a sample of (40) female students in the third year of the Faculty of Physical Education for Girls - Zagazig University, and they were divided into two equal groups, one experimental and the other a control group, each of (20) students