Gymceling is one of those things that's very hit or miss, and it largely depends on what you're working with in terms of face and height, and age too. In general, it mostly won't work miracles. And very rarely improves the type of women you can get. Most of time it won't lead to ascension if you're a virgin incel for years on end and/or completely hideous facially.
A few scenarios/examples in which it could drastically boost your SMV.
Scenario: A
You're like 15 years old, and have a pretty good face, but your height is lackluster although still not too short, but you're also very skinny or skinny fat. A few years of serious gymceling can turn you from the cute guy that foids say "Awwww, he's so cute... and a nice guy, bf matieral" to "OMG , he's fucking sexy, plzz fuck me daddy"
Scenario: B
You've been 45+ pounds overweight all throughout your childhood and most of your teen years, but you have good height and facial bones/ features, but it's hidden underneath all that disgusting fat. Girls have always liked you as a friend because you're charming and funny, but you're too fat for most of them to ever want to fuck you.
Scenario: C
You're a normie, with an average face that's not ugly, nor particularly attractive, but have decent or tall height. However, you're not that social, and don't have a large social circle of friends and generally not very extroverted, but still not at basement dweller level.
Gymceling can boost your SMV high enough that you can cope with fucking/dating sub 5 chubby women from Online dating and apps.