Our expert says:
Getting fitter usually makes one more healthy and all the scientific evidence says that people who are fitter from exercise are less likely to get sick.
However, the problem with this is that because you are active now, you may be putting yourself into situations where you can get sick more easily. In otherwords, being at the gym exposes you to more people who may be sick than before you trained. I doubt it's the pool water, though I'm not going to rule it out, but it's more likely the enclosed space plus air conditioning.
I think that what you need to do then (because you can't change these things, unless you start exercising outside), is to look at diet and recovery. If you are eating insufficiently, then certainly your immune system can be affected, so that's the first thing to look at. Then recovery is also key - when you eat, how you rest, because if you don't it can easily cause you to become sick often. But then the other thing is that you've only been sick once this season so far, it's just that you have not recovered, and perhaps what's happening is that you are trying to exercise to soon, and if you took a week or two off completely, you'd be able to exercise with no trouble.
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