Fitness
Internal Training Load
Internal training load measures physiological stress from a session—via RPE, heart rate, or similar—not just distance or weight moved.
Internal training load reflects the physiological stress you actually experienced—heart rate, RPE, lactate response—not just miles or kilograms moved. Two athletes can share external load but diverge internally based on sleep, heat, and stress.
Track internal signals to autoregulate hard days.
Common questions
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What is the difference between internal and external load?
External load is work done—distance, sets, watts. Internal load is how costly that work was for your body on that day.
Related terms
Put Internal Training Load into practice
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