Why is it so hard to find a Boxing Gym to learn boxing for the sake of physical fitness?

I live in a fairly small city. I am 35 and was considering taking boxing as a means to fitness. I can't find one. I take Brazilian Jujitsu, but would like to take boxing as well. There are MMA classes, Karate, Taekwondo, Kungfu, everything except for boxing. Why is that? Why is it so hard to find a Boxing Gym to learn boxing for the sake of physical fitness?Where are you located? Our boxing gym allows boxing for fitness as well as boxing for competitors. Check us out at www.sprucegroveboxingclub.com