You can read about Cantienica (just google it) for free and get a kindle book (Tigerfeeling) for $10 - gives a good explanation how it works and exercise.
If you are lucky, you may have classes in your area (I am not! LOL). There is an online course in English ($300), but I think better get the book first.
It is ideal for 50+ females, as it addresses common challenges we face at this age. Maintaining good posture means you would never really "age", retain the mobility and health. Bonita Cantieni is a living proof.