For some reason, many autistic people have low muscle tone. They also tend to be uncoordinated and stereotypically suck at sports, especially ones that require many different movements and not repetitive autist shit like ping pong and shooting foul shots. About 30% have considerably low muscle tone. Another 30% probably have somewhat weak muscles, and 40% normal or above average. A big part of sports and fitness is being coachable. People usually have to learn from a trainer how to have proper form, how often to work out, how much weight to lift on a given day, etc. Chris is not coachable. He also has no sportsmanship (having fits any time he lost in Pokemon at the gameplace, epic sperg out when he lost to Adam Stackhouse, etc). So sports weren't an option.
If he had a basketball hoop at home and Bob never let him have the internet or TV though, I could see him being one of those autists who shoots foul shots constantly. Then plays high school basketball. Chris was the water boy, but if he didn't have videogames, I could see him being one of those autists who rides the bench but then gets put in for foul shots, or maybe plays a few minutes at the end of games when the team is way ahead or behind.
As far as fitness, we'd have to assume that his blocks are purely mental, which I doubt. Even if he were to eat right and train properly as a teenager, he'd see other guys his age getting larger gains for less work. I could see him getting frustrating low plateaus despite putting in the work. If he was really dedicated, I could see him trying steroids, getting some gains, but then overinflating said gains. That would lead to drama with other members at the gym, and he'd eventually be kicked out for autist behavior. Roid rage would have interesting effects on his sperg brain. If he had the internet, he'd eventually find Bodybuilding.com and become a Miscer, where he would promptly get trolled. Someone would catfish him, which would be funny. He might have a youtube channel, which other fitness channels would troll.
At least instead of wearing the Classic, he would be decently in shape, allowing him to get away with wearing gym clothes every (and hopefully showering).
If he was a really hard gainer but still obssessed with weights (meaning he lifts like crazy and puts in the work but his genetics are so shitty that he barely sees any gains before a plateau that is only marginally stronger than a normal person his age), I could see him becoming a synthol freak. That's a guy who injects oil into his arms to inflate them. Ends up looking like a freakish balloon animal. TBH I'm surprised some oil injectors haven't been turned into lolcows, like Kirill Tereshin and Valdir Segato.
TLDR, if Chris lifted, he would not be a Chad. But he would be better off. Unless he was a synthol abuser.
Source about the low muscle tone:
https://www.autism-society.org/what-is/diagnosis/related-conditions/
Then again, here's an article about a kid with autism who set state records in his age group when he was 12.
cuttystrength.com
It almost reads like the Sonic Sweepstakes news story from an alternate universe.
Pic of guy squatting in red and black gear is what I think Chris would look like if he lifted in the best case scenario. Dude is yoked but not that yoked. Pic of shirtless guy is what I think he would look like in the worst case scenario. He's Kirill Tereshin, aka the Russian Oil Spill. Notorious synthol freak. Those bulges on his arms aren't muscles; they're masses of congealed oil that he injected into his arms. If he spoke English he would probably be a lolcow.