1. A physical activity monitoring system comprising: a wearable sensor device configured to generate physiologic data associated with a sensed physiologic condition of a wearer, and to generate audio context data associated with a sensed audio context of the wearer; a memory including program instructions stored therein; a computer configured to receive the physiologic data and the audio context data and to execute the program instructions to distinguish between dynamic and static activities of the wearer based upon the physiologic data, and to generate activity data by differentiating between different classes of distinguished dynamic and static activities based upon the audio context data; a user interface operably connected to the computer for rendering the activity data; and a microphone sensor, wherein the computer is configured to execute the stored program instructions to differentiate between different classes using a frequency analysis of the audio context data.