Found this interesting piece by Dr Ryan Andrews of Precision Nutrition. It's called Exercise When Sick: Should You Sweat it Out or Should You Rest and Recover?
It shares some intriguing points. Here’s one of them:
When we’re sick, the stress of a tough workout can be more than our immune systems can handle.
Still, there’s no reason to dive for the couch the minute you feel the sniffles coming on. Unless you’re severely out of shape, non-strenuous movement shouldn’t hurt you — and it might even help.
If you want more, give the full ...