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 by the Medical College of Wisconsin found the average calories burned jogging on a treadmill for one hour was 705 to 866. By comparison, an estimate by Health Status found using an elliptical trainer for one hour will burn approximately 773 calories.