First things first: prevention.
Clean the equipment before and after every use.
Common sense and hand washing go a long way.
If you do get sick, an easy way to determine if you should avoid the gym is the neck check.
If the symptoms you're experiencing are above the neck, like sneezing, stuffiness, or pressure, some light cardio may actually help.
Getting that stuff moving and getting that out of your system is going to help you prevent it from draining down below the neck, which is when it starts to become more of a respiratory problem and that's when it's going to keep you out of the gym
Fever, achiness, and chest congestion are just a few of the reasons to rest.
If you are stuck at home, certain yoga poses can help you relax and alleviate congestion.
Breathing exercises also provide relief without putting chemicals in your body.
A lot of times when we're sick, the reason we get our chapped lips, the reason we get dry, is because we're trying to breath in through our mouth because our noses are plugged up so it's just the idea of clearing up your nose.
Once you start feeling better, it's best to ease back into your routine.
As an athlete, you're trained to 'play through the pain.' but too much, too soon can set you back even more.
Listen to your body. Do what feels good. If you start to feel dizzy, if you start feeling uncomfortable, if you can't catch your breath, if you're not feeling right, that's your body tell you, ok we need to go get some tea and lay on the couch.
Of course, it's best to check with your doctor to clear you for physical activity.