Our expert says:

FitnessDoc

HI there

Pretty much right away, provided you're sure that the symptoms you're left with are not those of a systemic infection. Particularly when it's yoga - you can do that pretty much right away, because the risk is low. That risk, obviously, is that a viral infection can affect the heart and then you can develop pericarditis which can be fatal.

However, for sinusitis, which is a local problem with inflammation of the sinuses and not a viral infection, it's different and so you can train. You might feel a bit lousy during training because your breathing will be affected and you might be a little tired, but if you just back off a little, you'd be fine.

If you get flu, then it's important to rest and recover well. No point risking it for the sake of a few days of training. For flu, a week after symptoms are cleared is usually safe, though again, those are just rules that don't always fit every case. The key is that the symptoms must be gone.

Good luck