hello, i have a severe case of scoliosis. and its REALLY evident. like my back is almost close to 2 inches curved to the left. it pushes my ribcage that direction and the left side of my back seems like it has all the muscle from both sides and the right side has some kinda muscle deficiency or something.

please help on details of any products or excercises that will help me out for doing parkour. since posture is a big deal. i lean to the left and its a problem.
again any help will be GREATLY appreciated.

Well this is something you have to speak with your doctor about. My recommendation would be practice the elements of parkour movement that involve as little impact as possible. Balance drills on rails, foot placement and precision, general fitness, techniques like quadrupedal movement, climbing, maybe vaulting. What do you know about your condition? Have you spoken with a doctor about your ability to play sports or do physical activity?
I believe everyone can do parkour, everyone can find a way to better themselves through movement and interaction with your environment, but people with special medical conditions may not be able to practice the same way others do.

Talk to your doctor. If your scoliosis is that severe, he/she should be giving you some exercises to help correct the imbalance, and you should be doing them per your doctor's instructions.

However depending on your age, your doctor may be waiting to see if you outgrow it. Sometimes with growth spurts, scoliosis will correct itself. It depends on your body and only you and your doctor know the best way to deal with it.

I would also suggest you talk to your doctor about parkour and educate him/her on it (doctors tend to freak out when first introduced to parkour, unless it's presented very appropriately, because all they see is a bunch of potential ER trips), to find out what type of modifications (if any) you may need to make to your training. Especially address the issue of the roll, because the roll is a foundational skill in parkour and scoliosis will definitely affect your roll.

Having said all that, I do know that ballet training tends to help a lot with scoliosis because of its emphasis on body alignment and symmetrical training. Look for a school that offers a strong technical foundation. I can help with this if you want. My guess is that Iyengar yoga would also offer similar benefits, because of its emphasis on alignment, and its heavy use of standing asanas.

See what your doctor says, and ask him/her about the ballet and/or yoga, if you like, and see what shakes out.

Hope that helps!