I can't remember ever not riding because I was sick. Now that I'm thinking about it, I don't think I've been sick (other than a cold) since I started riding. Maybe riding has helped my immune system? The worst I've felt on the bike was once when I had a headache. I won't ride with one again. It was not fun. Actually, it was really painful.

I ride with colds. I wouldn't ride if I were achy or nauseous.