I like all yoga! Flow is more for elderly or people with injuries. I would check with that gym and see what they mean and if that is what the class is for. I would try the one class or just sit in on one and see if it is for you. You want a teacher who will not force poses on you. To be able to just go into childs pose during a pose that might hurt you or you are tired is good to have. I have had teacher's hurt me because of how flexable I am. It is fine to push me BUT I got pushed to far and threw my neck out. Went to a gentle yoga class while hurt and went for a year. Just nice to have a slow class that really makes you familiar with the poses. Then you can move on to other types. I like them all now. From relaxing to the sweat your butt off types.