Darjr, I don't think the rules (at least in 1st ed.) actually stipulate either way. I think it is most commonly interpreted as a non-magical consequence of a fighter's training regimen, but some DMs might regard all exceptional strength beyond a certain level as supernatural. I highly doubt that many would take offense at either characterization. The cavalier class, on the other hand, may be contentious for more reasons than just ability score increases!
Now, why might one regard it as magical? That could arise from a comparison of the capabilities with those of real-world athletes. I'm not saying that the evidence would (or would not) warrant that conclusion, as I have not examined it.
Magic, the supernatural, is what breaks what we perceive to be the laws binding the natural. It is what we not only do not observe in the real world but consider practically impossible. Naturally, one cannot (for instance) simply will the movement of other beings; that does not match our knowledge of cause and effect.
Now, why might one regard it as magical? That could arise from a comparison of the capabilities with those of real-world athletes. I'm not saying that the evidence would (or would not) warrant that conclusion, as I have not examined it.
Magic, the supernatural, is what breaks what we perceive to be the laws binding the natural. It is what we not only do not observe in the real world but consider practically impossible. Naturally, one cannot (for instance) simply will the movement of other beings; that does not match our knowledge of cause and effect.
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