SIR (Sessional Intensity Rating)

The SIR (Sessional Intensity Rating) measures how physically intense a training or exercise session is. It combines data on heart rate, exercise duration, and effort to provide a single score that reflects how hard the session was on the body. Higher SIR scores indicate more demanding workouts, while lower scores suggest easier sessions. This metric helps athletes and coaches track workload, manage fatigue, and plan recovery, ensuring training intensity is appropriate for goals and preventing overtraining. Overall, SIR offers a practical way to quantify session effort objectively.