Automatic cycling workout detection systems and methods

Devices, systems, and methods can be used including receiving motion data including comparing time-stamped speed data with predetermined cycling speed ranges, categorizing the speed data into portions of a minute that indicate each of the predetermined cycling speed ranges, determining portions of a minute indicate a cycling activity has begun, determining portions of a later minute indicate a cycling activity has paused or ended, confirming a minimum time inactive indicating that a cycling activity has ended, and determining that a minimum time active has elapsed between the indication a cycling activity has begun and indication a cycling activity has ended such that a cycling activity is categorized as a cycling workout.