A lot of the comments are raising how unsafe it is to be exercising through 10 years of life without a day off, but as someone who also tends to let a day off turn into a year off, I can appreciate the wisdom of slowing rather than stopping / having a slow day rather than an off day.
I really enjoy the philosophy of the 80/20 rule for running (Book from Matt Fitzgerald), which says that 80% of your training should be at level 2, where your heart rate is much lower. It's made it a lot easier to actually go run every day, as it doesn't leave me feeling exhausted and it changes the psychology from feeling like I need to run faster to actually needing to slow myself down, which is really transformative for me in particular. YMMV, pun intended.
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.