I have a lot of low back pain due to arthritis so this affects my ilium. They say that one of the best things to do when you have arthritis is to stay active and moving.
This can be hard to do when your joints are stiff and your back hurts. I wanted to stay active, but didn't want to do exercises that would aggravate my condition and make it worse.
I have found the best way to stay active and not cause further problems with my ilium is by swimming. I am able to strengthen my muscles without putting extra strain on them.