Stats, Graphs and Number goodness

The heart-rate monitor I have has a way to capture the data and transfer it to a PC. This is cool because now I can monitor my work-out sessions and know how I'm doing. Below is my first cut at this.

On this graph, you'll see along the left side the heart-rate scale and the plot is of my real-time HR during the excercise.

The rainbow background shows 5 HR Zones (100% to 90%, 90% to 80%, etc). With my Max HR being 186.