Why You Shouldn’t Trust Calories Burned on Exercise Machines

You’ve just spent an hour on the treadmill, and the number on the screen tells you that you’ve burned 300 calories. Do you believe it? How did it get that number?

Your treadmill got that number the same way that the EPA gets gas mileage numbers: estimations and averages. Scientists had a lot of people run on a treadmill hooked up to a mask that calculated the amount of air they breathed, then used that to estimate the amount of calories were required to do the effort. Then they …

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