An introduction to fuel substrate utilization made visual: Performance occurs in cells.
Everyone 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.
This image is from Watson’s book, The Physical Rules