We present a large-scale study exploring the capability of temporal deep neural networks to interpret natural human kinematics and introduce the first method for active biometric authentication with mobile inertial sensors. At Google. we have created a first-of-its-kind data set of human movements. passively collected by 1500 volunteers using their smartphones daily over several months. https://www.royaltyfurnitureandappliancers.shop/product-category/armless-chairs/