The back of your throat is feeling dry and scratchy. Your nose is a little runny. Maybe you're feeling a little achy. You'd planned to workout today, but now you're not so sure. There's a chance it could make you feel better...you know, sweat things out a bit. But it's also possible it could make you feel worse. Maybe a lot worse. What do you do: workout or take a day off?
I've been asked this question quite a bit lately (we are knee deep in cold and flu season) and I recently had to deal with it myself.