The　exponential　growth　of　smart　electronics　has　intensified　demand　for　next-generation　wearable　sensors,　yet　achieving　optimal　flexibility,　durability,　and　biocompatibility　remains　challenging.　This　study　introduces　a　dual-network　hydrogel　(CMC-PAM-LM)　developed　through　the　synergistic　integration　of　carboxymethyl　cellulose　sodium　(CMC),　polyacrylamide　(PAM),　and　liquid　metal　(LM).　The　hydrogel　incorporates　two　distinct　crosslinking　mechanisms:　dynamic　coordination　between　Ga3+　ions　from　LM　and　carboxylate　groups　on　CMC　chains,　and　covalent　crosslinking　between　the　CMC　and　PAM　networks.　This　dual-crosslinking　strategy　endows　the　material　with　exceptional　mechanical　resilience　(fracture　stress:　114.81　kPa,　strain:　778.24　%),　superior　electrical　conductivity　(0.63　S/m),　and　self-healing　capability.　Furthermore,　the　hydrogel　demonstrates　remarkable　fatigue　resistance　(＞800　cycles),　rapid　strain　response　(∼30　ms),　and　universal　adhesion　to　diverse　substrates.　Its　efficacy　as　a　multimodal　sensor　is　validated　through　real-time　human　motion　tracking,　electrochemical　sweat　analysis,　and　secure　information　transmission.　These　results　establish　a　promising　material　paradigm　for　high-performance,　flexible　electronics,　providing　valuable　insights　for　future　wearable　technology　development.　©　2025　Elsevier　B.V.