Definition of organism for English Language Learners. : 1  an individual living thing. : 2  a system with many parts that depend on each other and work together.
Figuring out how many calories you burn when running is, on a simple level, a fairly straightforward calculation. Most experts (and lots of studies) suggest that a person of average weight burns about 100 calories in a mile of running.
According to the Mayo Clinic, a person weighing 160 pounds, jogging at about 5 miles per hour, will burn 606 calories per hour. To zero out your 4,000 calorie meal, you're going to have to jog for six hours and 36 minutes.