The Impact of Using CrossFit Training on Lactic Acid Concentration (Physical Effort), Specific Endurance Levels, and Their Relationship to the Level of Offensive Skill Performance in Basketball.

Research Procedures
Research Methodology:
The researcher used the experimental method using the experimental design of one experimental group, as it is suitable for the nature of this study.
Research Population and Sample:
The research population and sample were purposefully selected from young athletes under (13) years old at Al-Sharqiya Sports Club in Zagazig for the (2023/2024) sports season. The population included (25) players, from which (10) players were chosen for the pilot sample. The main research sample comprised (15) players who underwent the CrossFit training program. The researcher ensured homogeneity within the actual research sample
. Research Hypotheses
1. There are statistically significant differences between the pre-test and post-test measurements in lactic acid concentration (physical effort), specific endurance levels, and skill performance levels (under investigation), favoring the post-test measurement.
2. There are statistically significant improvement rates between the pre-test and post-test measurements in the variables (under investigation), favoring the post-test measurement.
3. There is a correlation between the variables of lactic acid concentration (physical effort), specific endurance levels, and skill performance levels (under investigation).