Embodiments of the invention relate generally to electrical and electronic hardware, computer software, wired and wireless network communications, and wearable computing devices for facilitating health and wellness-related information. More specifically, disclosed are systems, methods, devices, computer readable medium, and apparatuses configured to determine activity and activity types, including gestures, from sensed motion signals using, for example, a wear able device (or carried device) and one or more motion sensors. In at least one embodiment, a method includes receiving data representing a motion sensor signal and determining whether the wearable device is in a still state. The method also can include calibrating the motion sensor signal in-situ to form a calibrated motion signal, generating intermediate motion signals based on the calibrated motion sensor signal, and identifying an activity based on the intermediate motion signals.
