Abstract: Various implementations disclosed herein include devices, systems, and methods that provide a visual marker including a plurality of markings arranged in a corresponding plurality of shapes. In some implementations, each marking is formed of a set of sub-markings separated by gaps and arranged according to a respective shape, and the gaps of the plurality of markings are configured to encode data and indicate orientation of the visual marker. In some implementations, the plurality of markings are arranged in a plurality of concentric rings of increasing size. In some implementations, the orientation is encoded in a first set of gaps and data in a second set of gaps of the gaps in the plurality of markings.

Abstract: The present disclosure generally relates to methods for tracking the performance of a physical activity event. In some embodiments, the method is performed at a computer system that is in communication with one or more perceptual output generation components and one or more sensors and includes detecting a start of a physical activity, providing ongoing feedback relating to a target duration, and if the activity continues for at least the duration, indicating that the activity continued for at least the target duration.