Non, that is a super cool gadget. I don't have a cool gadget like that , but I use "map my run" and "map my ride" which are smartphone apps with some pretty cool features.
Cleo, I eat lots of butter. Butter is a good fat, margarine is not. Stay away from margarine it's not real food. I have read about the benefits of working out as you describe, with bursts of intensity, bringing your heart rate up and down. Many popular programs are designed around that concept and supposedly it's how our caveman ancestors naturally stayed fit for survival.