Street running and treadmill running both are popular forms of exercise. The question is how working out on a treadmill is different from outdoor running.
The treadmill offers a constant environment in which to exercise, the temperature, humidity and running surface remain the same weather you are in gym or at home.
Street running exposes to all the good and not-so-good aspects of the natural world. Weather conditions, cost, variable routes all these factors determine street running.
we now know that running outside and running on the treadmill is one of the same thing, we can identify the specific workouts as to when running on a treadmill might actually be better than running outside.