I was browsing the WebMD site to educate myself on one of my favorite subjects – health and fitness, of course and found this interesting tool. It determines how many calories you burn doing a certain activity. I thought it was really interesting. I looked up how many calories I spend sleeping and here were the results:
You can pretty much find out how many calories you burn doing the most common things such as, bicycling, running, walking, sleeping and sitting down reading.
Check out the tool and see how many calories you’re burning reading my site! 
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I put in my 50k race time from last September. Calories Burned: 4075
No wonder I was so hungry when I got done running.
This is a great site – I will be checking out my calories burnt this week by activity. Hoepfully should see some interesting results.