Abstract: In some aspects, an activity tracking system is provided, comprising at least one activity tracking device configured to track activity of a user and to generate activity data corresponding to an amount of the activity performed by the user, a server communicatively coupled to the at least one activity tracking device via a network to receive the activity data, the server configured to receive a request for data, determine the data based on the activity data received from the at least one activity tracking device, and provide the data. In some aspects, the request is received from a video game application for attribute data for an avatar of the video game application to influence at least one aspect of the avatar during game play of the video game application. In some aspects, the request is for access data to allow and/or control access to an electronic and/or online activity.