Finally a research paper looking at a group of ADULTS with Idiopathic Scoliosis and the effect of Scoliosis Specific Exercises on curve progression and Cobb angle!

They conclude that Scoliosis Specific Exercises proved superior to natural history in Adult IS and should be considered as a first line of treatment in patients refusing scoliosis surgery.

Larger and longer term studies are warranted but this is a good start.
Scoliosis Journal