Everything has a possibility to be good or bad. When masculinity goes wrong it generally leads to violence, abuse, crime, rape, unnecessary aggression, etc. When masculinity is positive, it leads to protecting people, bravery, courage, doing The dirty work that has to be done, sacrificing one's own well-being and physical body to protect others when they are not able to or need that help, sacrifice for the good of others, etc. I feel the anti-masculine folks think that if we got rid of masculinity there would be no more violence or crime. One of the harsh realities of life is that life is dangerous. There are dangerous people, dangerous situations, animals that will kill you, natural disasters, things of this nature. When masculinity is focused appropriately it is a protection against these things. We need and always will need people who will do the difficult thing, put themselves in harm's way for the sake of others, do the dirty work for the good of other people. That's the pinnacle of masculinity being positive in my mind.
I don't think that bodybuilding or powerlifting or athletics etc. Are inherently good or bad. If it enriches someone's life and helps them improve as a person, then it is a good thing. Using peds and pursuing those things doesn't automatically make you a better man though. I also don't think that being really good at a sport, super muscular, super strong, etc. Means that you are more masculine. It just means that you are more of that thing. In order to be more masculine there are other aspects to the person that must be elevated as well.