I've just started the Rock Steady boxing here in San Francisco.
I'm only on my 3rd class, but so far it seems pretty great.
We work with stationary bags and speed bags. We also face the mirror and just punch into the air. It's more about technique and hand / eye coordination. There is a lot more that goes on than just boxing - we also jump rope, pass a frisbee around, sit ups, squats, jumping jacks, medicine ball..etc. Sometimes they will put a rope ladder on the floor and we have to take certain steps in and out of it. They also add in the voice part and have us yell out as we're counting. And the floor is padded in case we fall. (That hasn't happened yet!)