Our expert says:
Yes, it can be dangerous to train with you have an infection. It can affect the heart muscle, and that's the big danger. However, it sounds to me that you have overcome the infection, your doctor feels it, and you have already been off antibiotics for 4 days.
So that considered, I think you can probably safely start training at an easier level than you did before. A safe rule of thumb is to say that you'll take 2 days for every 1 you were sick and spend that time building up to where you left off. So you may have missed out on 3 weeks, which is a long time, and so that means you don't have to take quite as long off. I think that 2 weeks of gentler exercise will be in order, and then you can build up again to where you left off.
The trick is to understand those symptoms - if it's just a cough and tight chest, then those are remnants of your infection, not the infection itself. So they are uncomfortable, but not dangerous. Just take care though, don't push your body too hard coming back, don't force anything, because you will only delay your recovery. So just take it easy, and see how things go moving forward.
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