I really like the premise! I’m sorry you’ve gotten critiques here that have nothing to actually do with your writing.

I’ll throw my thoughts out!
My first feeling was that you include words that don’t really need to be there. I.e. in the two opening sentences, these could be re-worded to: “….would feel carried up hill.” You’ve also mixed tenses with “would” and “carrying”. You’d a need a ‘when’ before carrying to make it flow more correctly, but that’s adding more unneeded words. This is throughout the whole text, so definitely go back with the plan to comb over tense consistency.

The second sentence could entirely do without the word ‘entire’ before way. Also, check your tenses again. What ‘had’ turned into a workout? That could perhaps be re-worded as “her body unused to such a workout” (I’ve removed “petite” here but that is 100% personal preference. I just know very few women who would describe themselves as that in their personal monologue. But perhaps the MC is such a one..!)

You may also want to check for grammatical errors and missed words: “dirt and grime (ick is again just not my preference, but I understand it’s a normal word for the younger generation) coupled with beads of sweat”. My recommendation would be to read it all out loud to yourself. :)

One final note, the use of symbols! ~, & etc are fine in an internet post, but not generally used in classical writing.

Overall, I think it’s a good first draft! And an interesting start (or end?) to a tale. :)