• Low-frequency pulsed magnetic field stimulation significantly improved explosive power, aerobic endurance, muscle isometric endurance, and body composition in adolescents aged 12-13 years.
• The intervention did not significantly increase maximum strength, suggesting lower muscle magnetic sensitivity in adolescents compared to adults.
• Magnetic calcium-regulated mitochondrial technology may serve as a passive, non-invasive method to enhance adolescent physical fitness.
• The study provides evidence for the sensitivity of adolescent skeletal muscle and body composition to magnetic stimulation, offering a novel approach to address sedentary-related health issues.