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.
A study done by researchers at Syracuse found that men burned about 105 kilocalories/mile on average running a mile in 9 minutes and 30 seconds, and about 52 calories when walking the same mile in 19 minutes. For the women in the study, that burn was 91 and 43 calories, respectively.