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Not everyone gets that. I have exercised very hard at times in my life (American football in high school), and while I feel better in general when I’m active, and playing sports can be quite fun and rewarding, I have never gotten anything from running or other pure exertion other than tired and hungry.
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It's called "runners high", and true maybe not in the beginning, because we're all different, but we're also all the same, and over the course of a lifetime, the odds are in favor of you eventually experiencing it. Realistically, I only get it about 20% of the time I go out and the other 80% of the time, am relying on the knowledge that I'm doing good for my body.
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If in five years of strenuous exercise, four days a week, for ~30 weeks a year, along with significant exercise for 20 of the other 22 weeks a year, I never once experienced anything like it, I'd say that the odds are as close to zero as they could meaningfully be.

Not to mention riding a bicycle as my only mode of transportation other than foot for ten years before I had a driver's license.

I enjoyed tackling people. I did not enjoy the exercise itself and would not have done it if I could have skipped right to the games without having done all that other stuff.

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The impossible challenge of getting HN commenters to understand that other people may be different.
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For a forum that very often likes to pride itself on how “enlightened” discussions are, people are so arrogantly oblivious of one of the simplest and most well-understood facts that people are different. It’s just utterly depressing to see people arguing that “introversion is a choice, you just have to try harder”.
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That's right - its "impossible" to teach others about DOSE; how the chemical soup of the body works differently for everyone, including how environmental factors and behaviors of social interactions can affect it, and how someone may want to see an endocrinologist if they want a different outcome to their life. ;P
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You might want to elaborate a bit, because I have no idea what DOSE is besides an all-caps spelling of a word which means how much medicine you're given.

While you're at it, rolling in an understanding that people are different and not everybody enjoys any particular thing would not go amiss.

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"Happy" to.

DOSE - the happy chemicals of the brain - Dopamine, Oxytocin, Seratonin, and Endorphins.

Endorphins, in "most" people, are released during or after physical exercise. Upon release, they help reduce pain, which then sometimes triggers dopamine. This combination is called "runner's high", which can be why people choose to continue running. Those that don't ever "feel" this way, may give up on running and find other ways to get physical activity in their life regimen. Those that never physically exercise typically end up with weight problems, but not always.

The way the brain chemistry varies between people can be different based on many factors such as DNA, food, gut bacteria, environmental chemical exposure, and more... Humans, today, share the same set of chemicals empowering their bodies, however there is mostly small, but sometimes larger, variation in the quantities of those chemicals. So, we're all different, and yet we're all the same.

Chemistry plays a big role in perception of an activity - was it a good activity, or a bad one? Good activities tend to reinforce repeat behavior of that activity, bad ones help reinforce memories of what not to do. So, if you've never experienced runner's high, I could understand why you wouldn't be interested in running. Just don't be sedentary - the human body was not [built|evolved] for sedentary life.

... and not to bring AI into this conversation, but its why the tech is so different - its not tied to the materiality of our brain chemistry. Its merely the [approximate?] representation of our own brain electrical activity without the consequence of all that we are - pain, sadness, happiness, bliss, love, etc...

Full disclosure: I received a dopamine release from the writing of this reply ;P

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That's all well and good, but I don't understand why that means that we must have a physical ailment if we don't enjoy running after a few K. Even if every single healthy person experiences runner's high, what says that the individual finds that high to be worth the negative aspects?

I'm glad you found writing your reply to be enjoyable, because it's a lot of words to just miss the point.

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