www.kiteboardingexercises.com, awsome website covering pre and post injuries from kiting with exercise videos, well worth a look , but generally you need a good solid core strength if you want to push your kiting,

Yep suffer from this also, Irish weather doesn't help, I had back strain for years then culminated in a bulging disk , but I was the opposite to you in that the back injury I had was what inspired me to start kiting - back on topic found yoga on the wii really good but i only do certain excercises I'm practically pain free now (I'm 36) but am really cautious about what and how I lift,sit, etc etc

think you need to see a doctor bro!

At the gym, try and strengthen the muscle through compound lifts (start off light though!!). I suggest dead lifts and bent over rows. These will help your stabilizing muscles and prevent back strains a bit more..

Cheers

You can be massivly strong(gym weight strength) but if you have little or flexibilty you will strain really easy.

Yoga/pilates will sort it for sure, i am 40 and have been in various states of fitness over the last 10 years, the best i have ever felt is yoga(bikram) twice a week at least and swimming/running(not to much) or bike. You will build strength and flexibility.
Have had back problems all my life cos i am a tall skinny freak but nothing at all with this combo. Dont do the gym anymore.

Watch your hydration, if you get dehydrated(hungover etc) a chiro explained a definate correlation between this and weakness in the spine, its something to with cushioning(cant remember tech term) around the disks which have a supportive effect when hydrated but fail when dehydrated, a friend of mine is the same aswell.
Good luck