Comparison of the Effects of Selected Training Methods and SIS Stimulation on Balance, Motor Tests, and Strength

Inclusion Criteria: * Healthy individuals aged 19-40, * Without injuries, * Physically active persons, athletes. Exclusion Criteria: * periods of peak training load specific to the athlete's discipline, * evidence of overload-related pathology in the knee, hip, or lumbosacral joints, * the presence of any pain symptoms, * clinically relevant muscle fatigue or indicators of overtraining, * engagement in strength-based sports within several weeks preceding competition, * active inflammatory conditions involving osseous, articular, or ligamentous structures of the lower limbs, * a history of injury or surgical intervention within the 6 months prior to the study intervention.