Esit: I originally said that your.muscles are creating waste chemical quicker than your bloodstream can handlenso those bad chemicals build up locally and while this is true in a broader sense, I think it is more nuanced that that. Reading the article should give a better explaination
There's a few factors really, your out of shape comment could be one, no offence meant
If you're pushing your lungs, and airways in general, further than usual, and quite literally stretching them, and faster than they're used to, the extra stretching can cause that feeling.
Lessens as you get fitter.
If its proper cold, or.dry, and if you mostly breathe through your mouth, or both, the air isn't a match for the warm humid like air in your lungs and airways...nose breathing is a big thing to improve your running, there's a great guy whose name I cannot recall who is a massive advocate for nose breathng in runners and how it can massively help your long distance proper too! Includes things about dehydration lessening etc...worth a search for
None taken. I know I'm unhealthy. I smoke, too. So all that is a factor. Actually was wondering if it was just from use or if maybe I am not breathing the right way. Possibly both. I have a habit of subconsciously holding my breath when doing physical activity and I know that ain't good. lol
For what it's worth, the burning in the lungs you describe still happens when you're fit. It's just that you're going at a faster pace for a longer time before it happens.
There are alot of theories on what exactly the precise biological cause is, but there are known things that make it more likely, and ways to sort of treat it when it comes up.
Higher blood pressures and heart rates from exercising when unfit can cause small blood vessels to burst in your lungs as well. It's not usually enough to cause an issue but you can taste it in your breath.
I assume you know you're joking, But actually the main asset that let us our specie survive is our ability to run for long where we beat most other animals. Tons of average persons run marathon for fun. Try to bring your dog running and you'll see that you're best friend will get tired before you.
We don't have nice claws, we don't even run that fast. But we're one of the few animals able to run for hours and hours. Which mean that we could hunt by exhausting our target, and harvest fruits/vegetable over a long distance.
That's wild though, I can't jog for more than like, 5 minutes at most haha and I'm pretty fit like my BMI is pretty much perfect, no diabetus, body fat low etc.
Even as a kid my lungs would burn just running for like 10 minutes to the point of breathlessnes and collapse long before my muscles would even begin to feel tired, I never understood why they kept forcing us to but I guess it makes sense now.
I thought our evolutionary advantage was building guns honestly.
Someone wrote an awesome short story once about humans from an alien's perspective and how they will keep following you forever, until you can't move, until you're collapsed from exhaustion. I wish I could find it to share right now.
Only tangentially related to your question, but I've seen recommendations for Kettlebell ladders to increase your VO2 Max as a phenomenal way to train your lungs for running.