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.
Unsurprisingly, people expend two-and-a-half times more energy running than walking, whether thatâs on the track or on the treadmill [6]. So for a 160-lb person, running burns about 800 calories an hour compared to about 300 calories walking.