<![CDATA[Prolonged sitting during learning sessions calls for the design of practical, brief movement opportunities within lessons. This study developed an “active break” model for fourth- and fifth-grade elementary school students through the analysis, design, and construction phases of educational design research. The development resulted in a five-stage syntax (monitoring, selection, movement break, reflection, and return to learning), 20 movement cards—each offering a sitting alternative—teacher guidelines, a coded posture observation instrument, and a browser-based card selector that runs locally. A technical audit confirmed 20 cards with 20 unique codes, complete instructions and adaptations on all cards, a designed movement duration of 4 × 30 = 120 seconds, and the valid output of four distinct cards across 1,000 selection repetitions. The two-minute movement following approximately 30 minutes of sitting is a design parameter, not a WHO guideline. The study was limited to model design and artifact verification; therefore, it makes no claims regarding effectiveness or safety. The resulting prototype serves as a documented foundation for further testing with users.]]>
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