Strain sensors based on yield-stress fluid electrodes. (a) Normalized resistance change under cyclic uniaxial tensile deformations with the peak strains of 100%, 200%, 300%, 400%, and 500%. Inset: image of an as-prepared strain sensor. (b) Normalized resistance change in response to step deformations. (c) Real-time normalized resistance of the strain sensor to monitor dynamic motions of the index finger (c) and the wrist (d).