Whenever I dream where I am running, I feel really good and I am moving swiftly and effortlessly. It is an awesome feeling. (Very similar to dreams where I am flying.)
Conversely, I sometimes dream that I am running and feeling horrible, with heavy legs. But then I realize it isn't a dream!
But seriously, the other night I was dreaming that I was in a cross-country race. I was feeling really good and about to take the lead, then boom... I literally fell out of bed with a loud thud that woke up my wife. I hurt my knee, a finger, and a toe. Such a weird way and places to get injured.
I don't know. Maybe it was a demon yanking me out of bed by my toe!