A horizontal bar chart displays workout volume for muscle groups, with bars sized by sets per week and grid lines for readability. The chart uses D3 v5's `scaleLinear`, `scaleBand`, `axisLeft`, and `axisBottom` to generate SVG elements from a CSV file loaded via `d3.csv`. Axis labels and a title are added via SVG text, while tick formatting uses `d3.format`. The code removes default axis lines and relies on CSS classes for styling, including steelblue bars and custom font sizes.