All of the above. Depends. Speakers for when I want to share with others, or no one else will be disturbed. Noise canceling headphones when I want to isolate myself from the surroundings. Ear buds when I want to be portable.
I do. I do it every day, at a public gym/pool. It was originally a way to maintain or regain “ability” (don’t call it “fitness”, I’m still old and fat). After a while, you start feeling better, and some time after that, start noticing things are getting worse if you don’t do it.
For me, doing something fun, out of the house with others, helps a lot. Spin class, circuit training, water aerobics, having others around doing the same thing is motivating. I worked with a trainer for a while, they helped come up with things I like, for example, one of my favorites is tossing a medicine ball. Don’t ask me why, but I like that.