As far as I know, you can’t really run a yoga studio and make money, as retail businesses are set up to make money selling stuff. It is possible to sell yoga and sports equipment I believe. And it might be possible to set up a place to do yoga somewhere in your retail business. I’m not sure if a yoga instructor would show up though, and you won’t make money from doing yoga.... I am not even sure if customers would join in doing yoga there. If you aren’t worried about making money you could make a small yoga studio at your house, and invite friends over, maybe use the get together club system to make a yoga club. You could also use a generic lot to set up a yoga studio, but you would have to invite friends there. Others don’t show up on generic lots unless invited. Or, you could make a studio using the spa or gym lot. Again no money though.