That’s me! We weren’t permitted to ‘sit out’ at my high school in the 00s, but I repeatedly refused to dress properly, and very rarely participated in any way. I would just stand there, only move when the teacher yelled at me. When forced to run I would ‘run’ as slowly as humanly possible, taking 20 minutes to complete a mile run on one occasion. If forced to participate in team activities I would deliberately sabotage my team or hit the other kids with hockey sticks, etc. I was a big pain in the ass but the other kids seemed to find it amusing rather than annoying most of the time (unless they were the ones I was beaning with my stick). Teachers hated my guts for making their job more difficult but usually my gym teachers were the worst (IMO) and the hatred was mutual.
Disliking gym class began as soon as I was exposed to it in early elementary school. I am not at all competitive, can’t fathom caring about sports or who wins or loses, and hated the aggressive way the kids who did care acted. In particular, I hated the way the boys acted - I was always friends with more boys when I was young, and I remember that around 2nd-4th grade most of them turned into real dicks, and gym was the catalyst. It didn’t matter that I was the fastest kid in the class in 3rd grade and that I could’ve (and had) kicked the ass of any boy who gave me lip or made fun of my fat best friend - they all thought I was weak and inferior, just cause I was a girl, and if I proved them wrong they’d go out of their way to be nasty. Around that age I swore off boys, I never had straight male friends in school again.
The only real explanation I have for my problems with gym class and with school in general is that I have a negative attitude about life, and an authority problem. I have never done things just because everyone else does them, or because someone told me to, if I can’t find a sound reason why it’s right for me personally. School smelled like bullshit to me from day one and I passively resisted with all my might from 1st grade onward. If teachers wanted me to do anything other than sit at my desk and occupy myself with my own interests (I liked to read books of my choosing, draw, and write stories during class) it turned into a power struggle. I was a huge problem for my parents and teachers. But it could have been worse, I was always a very quiet and superficially polite kid and I never got sent to the principal’s office or suspended for misbehavior.
I’ve never been bullied, so that had nothing to do with hating school. Other kids usually thought I was crazy, but funny, and I always had a circle of close friends. I have done a little bit of bullying myself in fact, but only against kids who asked for it by being assholes or tormenting the weak kids in the class, if my memories are correct. I also never drank or did drugs in high school, but I hung almost exclusively with the ‘bad’ kids at school anyway (then I went home and holed up in my room, or went over to my teetotaling nerd friends houses).
Also, no one changed naked or showered at my school, ever. That would have been hellish - I was about 5 years behind all the other girls in everything but height, and I was intensely private about my body, wouldn’t even wear shorts or skirts.
I ended up leaving high school in 11th grade so I don’t know if my lack of gym credits in particular held me back. I failed a lot of classes… the only reason I didn’t fail every class and get held back multiple grades is that I usually went to class and I always did very well on tests, and on midterms and finals in high school. How well I did in any given class depended entirely on how much of the grade the teacher gave for homework, projects, and participation as opposed to proving I knew the material (I always did).
I guess my attitude towards school, gym class, and sports can be summed up as ‘This is stupid… FUCK YOU.’ And then I gave the finger to everyone, a lot, mostly while sitting in the corner.
ETA: OP, hope that’s an understandable explanation. Some kids are just born bitter and rebellious. I haven’t changed much.