I don't think 1mi per day is dangerous by a longshot but pushing through injury and sickness is wildly dangerous. heart infection is a thing, especially for men

Do you have e some evidence for this? I’m looking but having trouble finding any. May you are talking about myocarditis risk during/after influenza infection? Even for that I can’t find anything specifically showing that exercise increases the risk. I haven’t looked exhaustively though, and I’d love to see the evidence if you can point me to it.