If this article from getfitslowly.com is to be believed, then I shouldn't have put my 100 push up challenge on hold while I had a cold.
My dad always said (about exercise, among other things), "It'll either make you feel a whole lot better, or a whole lot worse." Maybe this is a truism, but my experience has been that exercise while sick usually does make me feel better. Especially running. Maybe that's because I'm more accustomed to running than to weight training or push ups?
So I guess my month-long break can be chalked up to laziness :P