Overwhelmingly when we look at our patients’ labs we compare their results with a reference range derived from ‘the general population’ aka couch potatoes! Therein lies our first problem. Exercise is recommended for health but we don’t know what this ‘looks like’ in terms of labs. The reference ranges reflect and assume ‘average’ muscle mass & haemodynamics & ‘average’ nutritional requirements in people consuming the SAD (standard Australian diet) none of which apply to the exercise enthusiast, weekend warrior, least of all the professional athlete! Given an increasing number of our patients are embracing exercise, this is an important instruction in what healthy looks like, how to make meaning of otherwise meaningless comparisons and ultimately enable you to distinguish between what is healthy exercise-induced adaptation, an artefact and an actual aberration that flags possible negative impact of emerging pathology for other reasons.