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GALIFS leverages gravity\u2010induced liquid flow to generate angle\u2010dependent electrical signals, eliminating the need for material deformation (e.g., stretching or compression) during operation. Unlike conventional inertial sensors (limited by rigid designs causing discomfort) or existing flexible sensors (reliant on stress\u2010induced signals and high material durability), GALIFS overcomes these constraints through its unique gravity\u2010driven mechanism. Furthermore, GALIFS operates without requiring perfect skin adhesion, significantly enhancing user comfort. GALIFS achieves a wide angular detection range (0\u00b0\u2013180\u00b0) with high stability (over 16000 cycles). Additionally, it can identify a diverse range of human motions, including neck bending, spine bending, squatting, jumping, walking, and running. A real\u2010time lying posture monitoring system for bedridden patients is further developed, showcasing its medical potential. Following successful mitigation of liquid evaporation issues, GALIFS may have significant potential for applications in various scenarios, including medical rehabilitation and sports training.<\/jats:p>","DOI":"10.1002\/smll.202412022","type":"journal-article","created":{"date-parts":[[2025,4,5]],"date-time":"2025-04-05T09:50:17Z","timestamp":1743846617000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Gravity\u2010Driven Air\u2010Liquid Interface Flexible Sensor for Human Motion Detection"],"prefix":"10.1002","volume":"21","author":[{"given":"Zhenqian","family":"Zhuang","sequence":"first","affiliation":[{"name":"Key Laboratory of Biorheological Science and Technology Ministry of Education College of Bioengineering Chongqing University  Chongqing 400044 P. R. 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