The study aimed to design a training program using the Fartlek training method to develop speed and strength endurance among preparatory school students, as well as to investigate the impact of Fartlek training on improving the technical performance of court defense skills in volleyball. The researcher adopted the experimental method with pre- and post-test measurements. The sample was selected purposively and consisted of volleyball players, specifically 18 second-year students. Six students were excluded for participating in the pilot experiment, leaving 12 students as the final research sample. The Statistical Package for the Social Sciences (SPSS)? was used to analyze the results. The findings revealed statistically significant differences between the pre- and post-tests in favor of the post-test. The progressive application of exercises positively contributed to the development of both physical and skill-related variables. The researcher recommended emphasizing physical and skill-related variables due to their importance in enhancing player performance. Additionally, the study advocated for implementing the training program—with its physical and skill-focused exercises—in regular training sessions, given its effectiveness in improving all tested parameters. The use of the Fartlek training method in training units was also encouraged, as it proved impactful in developing the physical capacities of the sample. 

This study aimed to identify the impact of designing agility ladder drills and their role in developing types of speed and improving the skill performance of the setup skill in volleyball. The researcher adopted an experimental method using pre- and post-tests over an 8-week training program, with a sample of 10 players from Al-Sahaf Al-Oula Intermediate School in Najaf Al-Ashraf. Statistical analysis (SPSS) revealed that the agility ladder drills contributed to developing specific types of speed among the research sample. Additionally, improvements were observed in speed test results and in the volleyball setup skill performance. The researcher recommends implementing the designed agility ladder exercises for their effectiveness in enhancing agility, flexibility, and coordination, as well as diversifying training methods to develop physical attributes.

The purpose of this research is to build a review study to analyse the situation of successful companies in the use of digital twinning to reduce waste and losses that occur in the lack of accurate investment of time and efforts made, and from this basis was presented a set of previous studies related to digital twinning in order to determine the findings of these studies and discuss them by identifying points of similarity and difference between these studies,  And then come up with an idea and a new mechanism to determine the behaviours that companies can pursue in order to apply digital twinning, and on this basis the research discussed the conceptual framework of digital twinning and then the mechanisms through which companies can use it in order to develop their ability to achieve strategic success and competitiveness, the research has come out with several results, foremost of which was that digital twinning works to build a digital model that parallels competing companies through data analysis, improving their efficiency, accelerating innovation, predicting trends, and Then improve the customer experience and achieve integration between the current systems and the systems pursued by other companies.