it also depends how severe it is - I have scoliosis for years and I have absolutely no major problems. If I sit for a long time (and it happens because I am journalist so I have phases of long sitting in front of computer) I feel mild pain and that's it. Of course, there are people with more serious problems.
Eva's suggestion is good - physical therapy is excellent choice for everyone - even if you don't have enough time to go regularly (I didn't) therapist will show you few exercises you can do at your home whenever it's best for you.
Also, I live in town with four rivers so I have plenty of places to swim. And swimming is miracle, believe me