**Objective of the Study:**
The current study aims to examine the impact of cross-training on certain specific physical capacities and the effectiveness of some complex skill performances in female kumite athletes in karate in Sohag Governorate.

**Research Hypotheses:**
- There are statistically significant differences between the pre-test and post-test mean scores for specific physical capacities and complex skill performances in the experimental group in favor of the post-test.
- There are statistically significant differences between the pre-test and post-test mean scores for specific physical capacities and complex skill performances in the control group in favor of the post-test.
- There are statistically significant differences between the post-test mean scores for specific physical capacities and complex skill performances between the experimental and control groups in favor of the experimental group.
Exploratory Study:**
The researcher conducted an exploratory study on a sample from the research population outside the main sample, consisting of 16 athletes. This was done to perform the scientific procedures for the physical and skill tests used and to assess their suitability for the current study.

**Scientific Validity Used in the Study:**
**Validity:**
The researcher used discriminative validity by finding the differences between two groups: one distinctive group consisting of 8 athletes and a non-distinctive group of 8 athletes. The researcher calculated the significance of the differences between the two groups to verify the validity of the tests.