Interesting. Online calculators put one hour of walking at 325 calories and biking at 750 cal per hour. Running is about 125 cal per mile. I've lost 10 pounds in 12 weeks. I don't fast. A slow go, but working on it. Running will replace fat with muscle mass. However, ten years ago I increased my mileage and lost quite bit, but also resulting in Achilles issues that put me on the shelf for a year. I've run over 10,000 miles in the last 10 years, I weigh 10 lbs more than I did 10 years ago. But on the plus side, I've have a lot of good food and beer in the last decade.