[mattbrewsbytes]

In this case the style or country of origin of the martial art doesn't matter, what matters is the school. In the US, there are a lot of schools geared towards advancement, like many belt colors, timelines for advancement, lots of children in classes, etc. You may want to look more into schools (or martial arts) where there are more adults and less focus on constant rewards.

Then I would say look at styles and research the instructors. I guess style research could come first if there are obvious things you don't want, like for example if you don't want to practice something with lots of ground work that is like wrestling, then avoid BJJ/MMA schools.

It can be expensive but when I went (long time ago) I did find it to be a good workout where I wasn't bored, like in a gym.

[taylodl]

This is good advice. I have a 3rd degree black belt in Tae Kwon Do. You're spot on finding a place that at least has adult-only classes. Adults and children train in completely different ways.

I'd also suggest finding a school that has emphasis on sparring and self-defense. Yes, the martial art is interesting, but at the end of the day it's practical to learn good street fighting techniques. Your martial art by itself isn't all that good for a fight involving guns, knives, baseball bats, and the like.

It's also good to have some ground-fighting techniques. You don't need to be a BJJ whiz, but you also don't want to be a fish out of water if you get taken to the ground. My TKD class was taught by a fireman, and it was 70% focused on TKD, about 20% on self-defense, and 10% on ground-fighting.

The school and the instructor are more important than the art itself.