In early 1920' Katharina Schroth developed the Schroth Method based on observations of her own scoliosis curve. Katharina wasn't a physiotherapist at all, but she had some experience in Swedish gymnastics...
She realized how her body was affected by scoliosis, and tried to reverse her curve by activating specific muscles she thought were affected by scoliosis. When creating the exercises, she wanted to make her body image as its own reflection in a mirror. In other words, what was collapsed, she wanted to make more protruding, what was protruding, she wanted to cave in.
She observed her rib cage and realized it could be compared to a ball deflated on one side. That's how the three-dimensional Rotational Angular Breathing (RAB) was born. The RAB is integral part of the Schroth exercises. When teaching a patient the exercises, an emphasis must be placed to proper RAB technique. The idea behind the RAB is that the consciously directed breath into the concave parts of the rib cage affected by scoliosis will expand those areas, while at the same time the convex parts will contract, thus preventing them from further expansion.
The Schroth exercises are neuromuscular exercises that aim to reprogram the crooked posture affected by scoliosis. They are performed in lying, sitting and standing positions, as well as, in walking. Every curve pattern has a specific set of so-called "pelvic corrections" that are designed to help patients to consciously correct their posture. The beauty of these exercises is that no specific equipment is needed, and, as long as you know what you are supposed to do, you can improvise anywhere you are! Also, the Schroth is not just about doing the exercises - it is also keeping your posture "outside of the curve". This means, that you should try to consciously push away from your scoliosis in daily activities. That is why it is very important to build a thorough understanding of your curve.