What does reactions time mean in physical education?

In physical education, reaction time refers to the amount of time it takes for an individual to respond to a stimulus. This stimulus could be visual (e.g., a light flashing), auditory (e.g., a whistle blowing), or tactile (e.g., a touch on the shoulder). The response could be anything from catching a ball to starting a sprint. It measures the speed at which the nervous system processes information and initiates a movement. A shorter reaction time indicates quicker processing and faster responses.