Health data user engagement, particularly with stress data, remains a challenge despite the widespread use of self-tracking products, like smartwatches and smart bracelets. Stress data engagement is crucial to the early detection and intervention of long-term stress which could cause harmful health effects. This paper explores the design of tangible displays to enhance engagement with self-tracked stress data. We conducted two co-design workshops in which participants were invited to design and draw sketches of stress displays for three different contexts. The workshops revealed many innovative ideas for using everyday spaces and materials as an interface to structure user interactions with the data, aimed at increasing awareness of stress data and management strategies while addressing various concerns associated with how the data is displayed. By focusing on stress data, this study highlights important opportunities to use everyday spaces as an interface for health data engagement. CCS CONCEPTS• Human-centered computing → Empirical studies in interaction design.

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