In my younger days, if I had a cold I would keep running, but nothing too strenuous: just steady runs, no reps or long distances. It seemed that running would clear my nasal passages well, but I wasn't sure if it might be delaying the recovery. These days, I don't run with a cold, I just go for moderately paced cycle rides or walks.

What do other people do when they have a cold, and do you feel that continuing to run is beneficial or harmful to recovery? Is there any objective research on this subject?

[Note: I am referring strictly to the common cold, not flu or any other condition involving a raised temperature.]