In Indy, vinyasa is used as a general term to connote linked breath to movement. Some classes will be harder than others. By harder, I mean more advanced poses and/or a faster pace. Just try it. You may like it, you might not. For me, a lot depends on the teacher and the setting/studio. I'm finding fewer and fewer teachers who actually teach proper form, which is a real shame. If I were you, I'd try Ahna Hoke's classes. She's big on proper alignment.