Eh, i don't know about gym but here a list of games with gigachad or powerful mc
Desert stalker (Absolute chad of an mc)(apocalypse Era game)
Vae Victis Khan (one of the best porn games of this Era, mc can be an absolute chad or psychopath,that depends you, with lots of optional fetishes) (medieval Era game?)
City of broken dreamers (chad mc also) (futuristic era game)
Depraved awakening (private investigator mc) (modern Era game)
Peerless lust(op demon lord mc) (fantasy Era in modern world, magic and stuff)
Savior (genetically modified mc, i don't know much about it, it's been a while I've played) (modern world game)
Homelander( it's been a while I've played but mc is kinda op?) (medieval Era game)
The seven realms (2000+ year old vampire prince mc, he's also op) (modern era game?)
WVM(basketball star mc, he actually goes to the gym tho but i don't know about being a chad) (modern Era game)
Superhuman (strong mc with powers) (modern Era game)
Well that all i can remember for now.