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.
On average, men burn about 124 calories per mile running while women burn about 105 calories running. Keep in mind body size and running intensity is a large factor for any calorie estimate.