## 4 Validation of Clustering Results
### Intervention Strategy Customization
#### 4.2.2 Female Group  
Cluster 1 (Aerobic Endurance Weakness Group, 35.13%): This group of female students shows the lowest scores in the 800 m run, indicating poor aerobic endurance. To improve endurance, systematic aerobic training should be implemented, such as jogging, interval running, and variable-speed running, with two to three sessions per week, gradually increasing the duration and intensity of running. Additionally, low-intensity aerobic exercises, such as jump rope, cycling, and swimming, can be introduced to increase the variety of training and enhance student participation. Regular testing of 800 m run performance should be conducted, with phase-wise quantitative goals set to progressively improve endurance and help students establish good aerobic exercise habits.  
Cluster 2 (Core Strength Weakness Group, 13.93%): This group demonstrates weak core strength, as reflected in the lowest scores for sit-ups. Targeted core strength training should be implemented, such as sit-ups, planks, Russian twists, and leg raises, with a focus on strengthening the abdominal and lower back muscles. Initially, simple movements and low sets should be used, gradually increasing intensity and sets, such as progressing from 20 sit-ups per set to 30. In addition, whole-body stability training, such as bridge exercises and side planks, should be incorporated to enhance overall body balance and stability, preventing injuries during training. The ultimate goal is to strengthen core strength and improve physical fitness.  
Cluster 3 (Comprehensive Ability Good Group, 51.61%): This group of female students performs well across all fitness indicators, demonstrating strong overall physical fitness. To maintain this advantage, the training plan should emphasize comprehensive physical development through diverse training programs that promote balanced improvement in different physical qualities. For example, combining strength training (e.g., weighted squats, burpees), speed training (e.g., 50 m sprints, shuttle runs), and flexibility training (e.g., stretching exercises, yoga) will further enhance physical fitness. Additionally, reinforcing training for standing long jump, 50 m sprint, and sit-ups will ensure the consolidation of strengths. Fun and competitive physical activities (e.g., relay races, challenges) should be incorporated to stimulate student enthusiasm and encourage sustained training, thereby maintaining physical fitness advantages.  
Cluster 4 (Lower Limb Explosiveness Weakness Group, 10.32%): This group exhibits weak lower limb explosiveness, with the lowest scores in the standing long jump. To address this issue, targeted lower limb explosiveness training should be implemented, such as squat jumps, box jumps, lunge jumps, and single-leg jumps to strengthen lower limb muscle power. Additionally, strength training exercises, such as weighted squats and deadlines, should be used to improve muscle endurance and explosiveness in the lower limbs. For the standing long jump, technical guidance should be provided to optimize jump posture and ensure efficient force output. Regular evaluations of long jump performance should be conducted, and training plans should be adjusted according to progress to gradually enhance lower limb explosiveness and jumping performance.  
By tailoring scientific and rational intervention measures to address specific issues within different groups, students' physical fitness in weak areas can be effectively improved, leading to an overall increase in health levels. The male group should focus on improving endurance, strength, and lower limb explosiveness, while the female group should concentrate on enhancing endurance, core strength, and lower limb strength, ultimately achieving balanced physical development across different groups.