Even if that was true, getting my heart rate up to 170 for 20 mins twice a day has dropped my resting heartrate into the 50s, so regardless I'm still using less beats overall in a day than a fat with a resting rate of 70 (if they're lucky, considering it's usually in the 80s if not higher).  Based on those numbers I'm using an average of 24,000 fewer beats per day than a fat, and that's without even factoring that I've recorded myself going as low as the high 30s during the deepest parts of my sleep.