Abstract: An activity tracking system is configured to receive an activity report identifying a fitness-related action that is reported to have been completed by a participant. Upon receipt of the activity report, the activity reporting system verifies the workout, e.g., by obtaining data that can be used by the activity reporting system to determine whether the activity report represents actual activity as reported by the participant or, in the alternative, suspect activity. Based on the data obtained from the one or more data sources and the information in the activity report, the activity tracking system determines a probability that the activity report represents legitimate fitness activity. This probability determination may then be output or reported to other systems (e.g., fitness history databases, websites, and the like, third party systems (e.g., incentive systems, reward systems, and the like).

Abstract: A system for gait analysis may include a mobile data recording device configured to record accelerations associated with user motion and a data processing device in communication with the mobile data recording device. The data processing device can be configured to receive acceleration data from the mobile data recording device and process the acceleration data to extract stride data sequences from the acceleration data through use of bounding boxes on one or more points of the acceleration data. Each of the stride data sequences comprising data for a corresponding stride. The bounding boxes may define time and acceleration bounds. The data processing system may further determine one or more stride metrics. According to one embodiment, the data recording device may be a smartphone or other device having an accelerometer with a limited range that is inadequate to capture the full range of accelerations experienced by a runner.

Abstract: The invention provides a large technological infrastructure to provide a unique comparison of athletic performance using a system. The system can include a unique point system and can compare aggregate athletic performances of different users across different geographical tracks or sections (i.e., Courses). Advantageously, people who cannot do the same course(s) can compete with one another; aggregate performances can be accumulated to give an overall performance metric; and people with differing abilities can compete with one another.

Abstract: An activity tracking system is configured to receive an activity report identifying a fitness-related action that is reported to have been completed by a participant. Upon receipt of the activity report, the activity reporting system verifies the workout, e.g., by obtaining data that can be used by the activity reporting system to determine whether the activity report represents actual activity as reported by the participant or, in the alternative, suspect activity. Based on the data obtained from the one or more data sources and the information in the activity report, the activity tracking system determines a probability that the activity report represents legitimate fitness activity. This probability determination may then be output or reported to other systems (e.g., fitness history databases, websites, and the like, third party systems (e.g., incentive systems, reward systems, and the like).