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Being overweight has serious health consequences for schoolchildren. Schools use different physical education (PE) programs for obesity prevention in children, but the overall positive impact of school-based interventions is questionable. This scientific work investigated the effects of high-intensity interval training (HIIT) intervention on physical fitness performance and body mass index (BMI) of overweight primary schoolchildren (seven years old males). Sixty-four boys, who had overweight, participated in this study. All participants practiced 44 PE classes. Control group (G1; n=32; mean age: 7.46±0.32 years; mean height: 123.35±3.28 cm; mean body mass: 27.81±2.32 kg; mean BMI: 17.82±0.11) performed curriculum PE during the investigation. The experimental group (G2; n=32; mean age: 7.54±0.27 years; mean height: 123.26±3.41 cm; mean body mass: 27.84±2.07 kg; mean BMI: 17.78±0.14) performed sixteen-week HIIT intervention in PE classes. Participants' height, weight, BMI, and physical fitness: push-up test, running sprint test, standing long jump test (SLJ), seat-and-reach test (SRT), and six-minute walk test (6MWT) were assessed in pre- and post-PE intervention. There were significant (p

Background. Experts note the low level of physical fitness of female students. Fitness programs that balance the development of cardiorespiratory and strength fitness level are necessary in the physical education practice of students. The purpose of this study is to compare effectiveness of two exercise programs in terms of strength endurance and cardiorespiratory of female students in physical education. Material and Methods.Female students (n=36) practicing fitness–aerobics (G–1) and resistance training (G–2) participated in the research. All students participated in 52 training sessions. The students (G–1) practiced step aerobics with strength training combination. The students (G–2) practiced resistance training with Kangoo–Jumps fitness combination. The level of cardiorespiratory and strength fitness was studied using tests: VC, Stange test, Step test (PWC170), Running test, Push–Up test and others. Results.Students (G–1) had a reliable advantage in test results: VC, Stange test, Step test (PWC170), Running test, at the research beginning. Students (G–2) showed significantly better results in tests: Burpee test, Push–Up test and Stange test at the end of research. Reliable differences in tests: Plank test and Heart Rate in favor of female students (G–2) were revealed. The results of other functional tests did not differ significantly.Conclusions.The possible effectiveness of aerobic fitness training Kangoo–Jumps in resistance training of female students was discovered. A significant increase in the indicators of strength endurance and cardiorespiratory fitness of young women was revealed.