This visualization adapts an SVG muscle diagram from the Army Combat Fitness Test to track which muscle groups have been recently exercised. It shows a front-view body with highlighted regions representing activity, designed for a fitness app where workouts target specific muscles and visualizations fade over time. The code loads existing SVG paths from the original diagram, recolors them to black, and appends them to the page. All rendering uses raw SVG elements and inline path data, with no external libraries or JavaScript APIs beyond standard HTML document manipulation.