The "11 for Health" Program Intervention and Its Impact on Polish Children

Health knowledge will be assessed using the "11 For Health" Health Knowledge Questionnaire. This questionnaire evaluates children's understanding of key health topics, including nutrition, physical activity, and hygiene. It consists of multiple-choice questions, aimed at measuring the knowledge acquired during the program. Higher scores indicate greater health knowledge (min= 0, max= 36)

Wellbeing will be assessed using the Kidscreen-27 questionnaire, which evaluates emotional well-being, social functioning, and general life satisfaction. It uses a Likert scale to assess happiness, relationships with family, and feelings of self-worth, capturing the child's overall perception of their quality of life. Higher scores indicate better well-being. Higher scores indicate better well-being (Minimum = 27, Maximum = 135).

Aerobic fitness and endurance will be assessed using the Yo-Yo Intermittent Recovery Test Level 1 (YYIR1C), which measures the total distance covered in a repeated sprint and recovery format. A greater distance (meters [m]) indicates better aerobic capacity.

Balance performance will be assessed using the Stork Balance Test, which evaluates single-leg balance ability. Time held in seconds ( higher scores indicate better balance).

Lower body explosive strength will be assessed using the Standing Long Jump Test, measuring the horizontal distance jumped from a standing position with hands positioned on hips. A longer (centimeters [cm]) jump indicates better lower-body power

Muscular strength will be assessed using the Hand Grip Test, which measures maximal isometric grip strength. Measured in kilograms [kg] (higher values = greater grip strength).

Core endurance will be assessed using the Plank Test, measuring the duration a participant can hold a plank position. A longer (seconds [s]) duration indicates better core endurance.

Speed and acceleration will be assessed using the 20m Sprint Test, measuring the time taken to cover a 20-meter distance. A shorter time (seconds [s]) indicates better sprint performance.

Cardiovascular health will also be assessed by measuring resting heart rate (HR) using an electronic heart rate monitor. Lower resting heart rate (Beats per minute [bpm]) generally indicates better cardiovascular fitness.

Cardiovascular health will be assessed by measuring resting systolic blood pressure using an electronic blood pressure monitor. Lower values (Millimeters of mercury [mmHg]) within a normal range indicate better cardiovascular health.

Cardiovascular health will be assessed by measuring resting diastolic blood pressure using an electronic blood pressure monitor. Lower values (millimeters of mercury [mmHg]) within a normal range indicate better cardiovascular health.

Body fat percentage will be assessed using an electronic bioimpedance tool (InBody 270) to determine the proportion of body weight composed of fat. Lower values (percentage [%]) within a healthy range indicate better body composition.

Skeletal muscle mass will be assessed using an electronic bioimpedance tool (InBody 270) to measure the total mass of skeletal muscles in the body. Higher values (kilograms [kg]) indicate greater muscle mass.

Dietary habits will be evaluated using the SF-FFQ4PolishChildren questionnaire. This tool assesses food frequency and dietary choices in children, including the types of foods consumed, frequency of consumption, and general eating habits. Higher scores indicate more frequent consumption of a given food group. The questionnaire assesses dietary quality based on eating habits and food intake frequency.

Physical activity levels will be assessed using the Modified PAQ-C ( Modified Physical Activity Questionnaire for Children). This questionnaire gathers information on the frequency and intensity of physical activities, including sports, outdoor play, and other forms of exercise. Higher scores indicate greater levels of physical activity.

The enjoyment of the "11 For Health" program and football in general will be assessed through questions like "How did you like the '11 For Health' program?" and "How fun do you think football is?" Responses will be recorded on a 5-point Likert scale to measure the child's (intervention group) enjoyment and overall satisfaction with the program. Higher scores (points, [min=2, max=10]) indicate higher enjoyment level.

Body height will be measured from the base to the vertex (top of the head) using a stadiometer to provide accurate data on the child's growth and development.

Body weight will be measured using an electronic scale (InBody), providing precise data on body weight. This method is commonly used in clinical and research settings.