Do you say when you were running or while you were running?

Answer:

They mean different things. "When" = "at the time that." "While" = "during the time that."

Did you lose weight when you were running every day?
You must carry water with you when you are running long distances.

I have a chance to enjoy the scenery along the trail while I am running on the hiking path.
It is hard to carry on a conversation while you are running.

First answer by ID3451679950. Last edit by SapphireMoon. Contributor trust: 903 [recommend contributor recommended]. Question popularity: 2 [recommend question].