Hey korpo

I assume you mean herniated discs in your back. Check out the reverse hyper, it's a great machine for active decompression of your discs. It strengthens the lower back without putting pressure on the discs. Most powerlifting and crossfit gyms have one, commercial gyms are also starting to pick it up.

Core work is also important, I use the ab wheel once a week. Remember to try and round your lower back and suck your stomach in throughout the movement. Do not arch. If you get pain in your lower back your doing it wrong.

I might upload a video of these if its interesting.