The researcher applied the experimental method as it is the most appropriate method for this research, using a two-group (an experimental group and a control group) experimental design with a pre-test/post-test measurements.
Research Sample:
The research sample was purposively selected from Kumite female youth players below 14 years of age in the Karate sport in the Golf Club, and the Suez Canal Club in Ismailia, who are registered with the Egyptian Karate Federation during the training season 2016/2017, and who are holders of the black belt (1st Dan) and brown belt (1st) at least. The sample consisted of 40 female youth players. Ten players from the same research populations and not included in the research core sample were assigned to the exploratory sample. Thus, the research core sample consisted of 30 players assigned to two groups: an experimental group and a control group, each consisted of 15 players.
Equivalence of the two research groups:
The researcher calculated the equivalence of the two groups (experimental and control groups) in the variables under research.