Fighters like fighting. Not in a stupid, backyard-brawl sort of way, but in an academically rigid, excited as a nerd at the Air & Space Museum way.
Fighters guilds are massive. They might take up multiple city blocks, and usually resemble military barracks, including dormitories. They have plenty of sparring yards and halls and employ apprenticeship systems.
Guild barracks in major cities will likely have masters of every discipline, but it’s common to find smaller garrisons with only one or two specialties in rural areas.