MyDepressionList

Well, I wasn't dying so much from the shortness of breath as from the heaviness in my legs. I have very weak legs, which is why I've avoided running since childhood, because it's just a pathetic sight. But I probably can't complain about my breathing and pulse. The main thing is to drink water in time so that my overall condition doesn't deteriorate.
But the load on my legs is painful in itself. I can't usually walk for long either; my legs get tired quickly and tell me to go away. But I think that excess weight, which I've gained rapidly in recent years, also plays a significant role.
In general, even for some level of effectiveness, you need to run for at least 40 minutes, not even half an hour. And only then does some fat burning begin, which is what I'm getting into this mess for.

Added 1 minute ago

I'll double down on Revan. If there hasn't been any serious cardio exercise before, or if there's been a long break, 20-30 minutes is more than enough for the first time. And you also need to find your own pace so that you can maintain it over the distance.

I don't have any problems with the pace either; I figured out what's more or less optimal for me a couple of years ago. I haven't tried to run at supersonic speed, only to collapse in the middle of the park.