The process of broification comes with many changes, many of which can and will surprise you once you go through the transformation yourself.
For me, all I had to do was join a gym. I had no intention of "becoming a bro" when I did. I just wanted to improve my mental health and wanted to look nice--and for the first several months that was my mindset--until something began to change in me.
The transformation can look different for everyone, but it can also have a lot of similarities. I can only speak for myself, but here are the changes I've noticed:
Feeling more confident: I noticed myself just not caring about negative opinions of me. While I try to always be nice to the people I interact with, I'm less willing to put up with bullshit and more willing to speak my mind. Boundaries will be set. Even the way I walk feels more naturally confident.
Feeling more masculine: That kinda goes with the previous item, but I also feel more confident as a man. I love my body, I love testosterone, I love having a penis, I love being a man.
Increased libido: I'm horny more often, especially with that pump of testosterone I get after a good gym session. I make a point of giving my cock the love it deserves.
Becoming more sexually dominant: While I've always felt like I had a dormant "dom side", I was always more of a vanilla kinda guy; but since I began going to the gym and embracing my masculinity, it's like that "dom side" finally woke up. And you can bet I'm going to have my fun ;)
New taste in clothes: I'm much more attracted to gym clothes, sports clothes, and clothes that show more skin, both in myself and in other people. I prefer short shorts and gym shorts, cut-off shirts, loose fit tank tops with drop armholes, basketball jerseys, sweatpants with no shirt on, among other things.
Sudden interest in sports: I was never a sports guy, but I grew a sudden interest and watching weightlifting and powerlifting competitions as an extension of my interest in fitness. That somehow led me to get curious about other sports too, like football (NFL). The funny thing is that this was a natural thing for me. At no point did I force myself to get into sports. It just happened.
Interest in meeting other bros: I began craving more brotherhood. I already had regular friends before, but I grew a sudden interest in befriending other bro types, both as people to get inspiration from as well as the fact that I now shared interests with them. I like to say that masculinity needs masculinity and that's what I felt. There's nothing like the bond between bros. You start craving people who are like you and match your bro vibes.
Changes in the way I talk: This one was more of a lowkey change, but I noticed myself become more slangy, saying things like "dude" and "bro" much more often, and even cussing a bit more (but like in a chill kind of way).
Change in personality: While I was always a chill and down to earth guy, I noticed the transformation put a layer of cockiness and upbeatness on top of my personality. There's a kind of "let's fucking go" energy about me.
Craving the gym: And of course, the gym. The more you go, the more you want it. Working out has become more than something I did just because I wanted to better my mental health or look nice. It's something I can't see myself without anymore. The gym has become my second home, because it's where I feel my best self.
I'm sure there are other changes too, but these were the ones that stood out to me the most. If you're on your journey of becoming a bro, keep at it. Keep showing up to the gym and let your mind be absorbed by it. Let it transform you. You got this, bro.