I read somewhere that the calories you burn walking/jogging are roughly the same for each distance...so for example, whether it takes you 30 min to run a certain distance, but an hour to walk it, you'll be burning the same number of calories either way, just spending more time.
Also, are you talking about physical health, or calorie burning purposes? Going faster (more distance/less time) gets your heart moving faster and is better for cardiovascular health and getting in shape. But in a technical sense, the calories burned is roughly the same.
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