Let’s say an average person burns 2,000 calories a day.

Let’s say I run an average of 10 miles a day which burns 1,000 calories.

That means I burn 3,000 calories.

I’m burning 36 hours worth of calories in 24 hours.

I’m burning 1.5 times the average.

No wonder I’m tired.

I should be tired.

Extra physical activity is tiring.