An introduction to fuel substrate utilization made visual: Performance occurs in cells.

Cell-&-WeatherEveryone knows ‘hot colors’ on a weather map express ‘hot temperatures’. Similarly, darker shades of yellow food colored water expresses increased nutritional demand (glycolysis) within the cytosol of a cell. Each cell image is then matched with the analogous physical intensity of whole body movement. The candles represent mitochondria, where oxidative metabolism occurs.

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This image is from Watson’s book, The Physical Rules