I think you mistook masculine qualities for muscles, mate. The most common mistake women make.
When it comes to building focus, discipline, and strong drive there are many titles to run at SC. The best of them is Ascension but also GLM tackles that as well. GLM serves to unlock and strengthen the “essence” of masculinity and these are not muscles for sure, although they may be useful… lol I know too many people with big muscles who lack core masculine qualities.