Re: Aikido with a back injury
I seem to be alone on this, but my advice is not to push yourself. A lot of people I talked to have said it did not make their back pain worse, but I have yet to meet someone in person who have said that it actually helped their back out. I just don't think that is one if the benifits. I have seen three people leave our dojo due to back injuries, but they also went in with the impression that aikido would help their back problems. It did not, only agitated the problem.
I know a lot of people who have had sucess with yoga, though. I might suggest that, but stay away from power yoga.