Running and travelling in car

[chound]

If u run for a distance, even though u r tired u feel refreshed. But if u travel in car, and u get out after 40 min u feel tired even if u didnt do any driving or any physical activity. Why?

[Jikx]

I think what you mean is that you feel alert, rather than refreshed after a run. I suppose that's the crux of it, with low activity, your heart rate is low, mental activity is (possibly) low, and basically you feel sleepy.