This is a quasi-experimental study with two parallel groups designed to assess the effectiveness of a health promotion educational intervention in primary school children.
Participants will be students enrolled in the 3rd grade of a primary school in Spain. Inclusion requires written informed consent from parents or legal guardians. Students will be assigned to either an intervention group or a control group based on natural classroom organization to avoid cross-contamination between groups.
The intervention consists of a single 45-minute educational workshop delivered during school hours. The workshop content includes promotion of physical activity, principles of postural hygiene in sitting and standing, correct backpack use, active breaks during study time, and basic concepts of musculoskeletal self-care. Standardized educational materials and audiovisual resources adapted to the children's age will be used to ensure consistency.
A knowledge questionnaire composed of multiple-choice items will be administered to both groups before the intervention and again after the intervention period. The repetition of the questionnaire in the control group allows control of the potential learning effect associated with test repetition, enabling attribution of observed changes to the educational intervention.
The primary outcome measure is the change in knowledge score between pre- and post-intervention assessments. Secondary outcomes include participant satisfaction with the workshop.
The study does not involve clinical or medical procedures, administration of treatments, access to medical records or collection of biological samples. Participation is voluntary, and confidentiality will be guaranteed by coding all data and restricting access to authorized investigators only.