yep, ideal body is comparative to a person who professionally plays sports like basketball, which are optimized for best athletic performance.
massive muscles are unattractive because they are unnatural, a few thousand years ago muscles that large would literally be impossible, the nutrients needed to build and sustain just wasn't available, alongside the lack of knowledge on targeting specific muscles for growth means that women have been programmed to be attracted to fit/muscular lean bodies that literally all our ancestors would've had.
the same goes for guys that are way too lean, 0-8% bf leanness long ago would've meant death.
think about how exaggerated and unrealistic bodies like kim k aren't attractive to most men, it's naturally impossible and is so idealized that it enters the uncanny valley, like some sort of alien interpretation of the perfect human body.
though degenerates now have fried their brain and eventually only find completely impossible bodies attractive, but that's a different subject, as most women aren't on par with hentai loving neets.