The effect of high-intensity training on cardiorespiratory fitness And some physical variables and performance effectiveness of karate players *Dr.Abdelatif Said Abdellatif **Dr.Abdulaziz El-Sayed Refaei The research aims to identify the impact of high-intensity training on cardiorespiratory fitness, some physical variables, and performance effectiveness for karate players. Procedures: The researcher used the experimental approach, due to its suitability to the nature and procedures of the research, through the experimental design of one group by means of two measurements (pre and post). The research sample was chosen by the intentional method of young karate players under 18 years old in Al-Safwa Club. Results: The training program using "Insanity" exercises led to the development of the cardiorespiratory fitness variables under study in the research sample. The training program using the "Insanity" exercises led to the development of the special physical variables and the effectiveness of the performance under study in the research sample. Keywords: Specific Reactive Agility- Offensive follow-up