Who catches a cold in July? My husband -- who then proceeded to give it to me!
Yesterday, it was still a mild cold so I had planned to do my hill workout (not fast or hard). Since it was raining, I opted to skip it. Why add rain when I was already feeling iffy.
Normally, I continue to train through a cold. Most of the time a cold is a little stuffiness, a headache, etc., nothing serious.
Today this cold seems to have settled in my lungs causing a pretty nasty cough.
The rule of thumb is -- if all of your symptoms are above the neck, it can be OK to continue training. If symptoms are below the neck, rest is recommended. (For more detailed information, check out this article from Runner's World).