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[[File:Training Intensity.jpg|right|thumb|500px|A chart of different TRIMP calculations against heart rate.]]
There are various ways of measuring the impact of exercise and these measures are often termed "[[Training Impulse]]", or TRIMP ('''TR'''aining '''IMP'''ulse). The simplest approach is to use training volume (mileage or time), but it is better to use [[Heart Rate]]. There are various [[Heart Rate]] methods to establish training load with varying degrees of complexity and sophistication. It is also possible to use perceived exertion or other metrics. It should be remembered that [[All models are wrong]], especially when we are trying to model something as sophisticated as the human body. Running at an easy pace for a long distance creates different training stresses from a shorter distance at a high intensity, and the two cannot really be equated in a usable model. However, some metric is important if we are to evaluate and understand a training program. TRIMP can be used to calculate [[Training Stress BalanceModeling Human Performance| Model Human Performance]], a method for evaluating to evaluate the effect of training over time.
=Training Volume=