Abstract: A swim training system and method includes a signal delivery sub-system configured to deliver signals to the swimmer and a machine vision sub-system with a detector and a target marker to be worn by a swimmer. The detector is configured to detect the target marker. A controller is configured to operably control the machine vision sub-system. A data processing sub-system is configured to process data collected by the machine vision sub-system and to generate signals for the signal delivery system. During a swim training session, the detector tracks a location of the target marker and transmits speed data to the data processing sub-system. The data processing sub-system processes the speed data and generates signals that are transmitted to the swimmer via the signal delivery sub-system in real time during the swim session. The signals are representative of a real time speed characteristic of the swimmer.