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.
How many miles a person should jog per day depends on his goals. If a person who weighs 150 pounds is running as part of his regular exercise routine, then 30 minutes, at six miles per hour, will be enough; around 342 calories can be burned during this time.