How does your body burn 2000 calories a day without any effort, but running a mile only burns 100 calories?
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Because those are the respective amounts of energy required to do those activities.
If you’re asking because you feel worn out and exerted after running a mile but surprised you’ve only burned 100 calories this is because 100 calories is a fair amount to burn in the relatively short time it takes to run a mile, compared to how long a day is.
Some numbers:
2000 calories a day is about 1.4 calories per minute.
Running a mile takes maybe 10 minutes at a jog, varying a fair bit by fitness.
So you burn 10 calories a minute for that mile, or around an 800% increase on your regular metabolism while you’re running. That’s a fair bit. Most folks can’t keep that up for long.
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