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.
Someone who weighs 160 pounds may burn 581 calories in an hour when jogging 5 mph, while a person weighing 240 pounds could burn 871 in the same amount of time. Walking at 3.5 mph might burn 276 calories per hour if you weigh 160 pounds or 345 calories if you weigh 200 pounds.