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.
According to the Mayo Clinic, a person weighing 160 pounds, jogging at about 5 miles per hour, will burn 606 calories per hour. To zero out your 4,000 calorie meal, you're going to have to jog for six hours and 36 minutes. That translates to 33 miles of jogging.