Am I too sick to work out?

I've had a cold in my chest for more than a week, but no fever. I get tired in the late afternoon, and start coughing when I'm tired. The first day this happened, I took a nap, but now I'm chugging along at pretty much my regular rate.

I've been doing yoga, but skipping the African dance aerobic cardio workouts.

Mulling over whether to get back on the track with the cardio class tonight, I did some online research. The best article I found quoted Mayo Clinic physicians advising against doing a major workout after a cold has settled in your chest.

So it's yoga at home again tonight.