@baristaben agreed, sort of. if your goal as an adult male beginner is to get good enough to join a decent ballet company, you're crazy. it might not be completely impossible, but it would take insane dedication (and talent, and flexibility).
on the other hand, ballet is an excellent way to learn a physical and mental discipline while getting stronger and more flexible. if what you want is to be relentlessly challenged, ballet will do that. i tried martial arts for a while and never found anything remotely close to the level of focus and difficulty of basic ballet classes.
and then, once you have some basic ballet skills, the worlds of modern, jazz, hip hop, etc become much more accessible. these other disciplines offer a lot more achievable performance opportunities for adult beginners. it's not that they're "easy", but the learning curves are much gentler than ballet, and you can actually look like you know what you're doing pretty early on. ballet fundamentals are very applicable to these other styles, too. (you'll find a ton of borrowed ballet terminology and variations on ballet poses/movements.)