Peter Parker in gym class
There was 10000% a point in time where everyone saw Peters abs in PE. There’s no way they could miss them. There first thoughts initially were probably the fact that ‘Holy crap, he could have destroyed Flash in 0.02 seconds if he wanted to’ but the next thought would probably be ‘how the hell is this huge nerd keeping up his grades and keeping his body that sculpted?!?’
You cannot convince me that people didn’t start going out of their way to start visiting every gym in New York to try and see what the hell he was doing only to never find him in any gym. People starting up theories that Peter had some kind of god-like training regime that he did at his own house. Someone spotting Peter entering Avengers tower for his ‘Internship’ and another theory began that he had access to the gyms in there.
Then Peter and Ned obviously find out about all of this stuff from MJ and find it absolutely hilarious. They decide it would be funny to go to one of the cheapest gyms in queens and just have him lift rediculously heavy things with as little effort as possible. Of course someone from school sees this and looses their mind. The next day they are trying to convince everyone that Peter Parker was lifting 500lbs with one hand and it didn’t even look like it bothered him. No one believes him of course.
One day in gym class however they do weight lifting , for some reason. At this point, everyone knows about Peters abs so he doesn’t even bother trying to hide his strength. He starts doing rediculous stuff like doing on the Avengers group chat and texting them while holding a rediculous amount of weight above his head.
It’s gotten to the point where no one even cares about it anymore and everyone kinda just knows Peter as the one who is really strong for some reason.