Heart Rate Training for the Compleat Idiot

Today was my first day at 'heart rate training'. I've been reading "heart rate training for the compleate idiot" so today I set out on an 'easy run' to try this stuff out. The book states that there are two 'magic numbers', your recovery ceiling (basically 70% of your max), and your threshold floor (close to 85% of your max).
The formula I used (Which they state right off is likely inaccurate) was
205 - 14 (half my age) + 5 (for being female). 196 is therefore my estimated max.
My estimated max - 53 (my resting heart rate, although this may not be accurate itself) gives me my range of 143. To get my recovery ceiling, I take that *.7 and +53 (to get my resting heart rate back in) to get 153.

So I set out around my apartment complex with my FitSense set to beep when I surpassed this Recovery ceiling of 153. Let me tell you, it was pretty easy to hit it! Luckily however I was able to get my heart rate back down quite easily, generally by stopping for one step, or sometimes just jogging slower. The little incline was the toughest, however, and I often had to walk.

What's really interesting is the graph of my heart rate versus speed. It will be interesting to see how things progress - right now the two lines are VERY close, I can only expect the deviation with them will open up as I'm able to go faster with a lower heart rate?