Abs work-out

One hour ago, I did an abs exercise routine. I need to turn my abs in rocks! ... or, that's what I'd like to do ... Not only for vanity or self-confidence, but for health reasons: I suffer from chronic backache. Doctor and chiropractor told me that I need to improve my muscles: abs and back. They would give me a string support for the superior part of my body, and help me to my improve posture. But I don't expect for immediate results: I think this will take at least three months before I can see any change. I hope not to get bored before that!

Abs work-out

One hour ago, I did an abs exercise routine. I need to turn my abs in rocks! ... or, that's what I'd like to ... Not only for vanity or self-confidence, but for health reasons: I suffer of (replace of with from)chronic backache. Doctor and quiropractic told me that I need to improve my muscles: abs and back. They would give me a string support for the superior part of my body, and help me to my posture becomes better(I'd put "to help make my posture better.). But I don't expect for (I would omit "for") immediate results: I think this will take at least three months before I can see any change. I hope not to get bored before that!

(Very good writing piece. I don't know the full grammatical rules but it seems like there are very few mistakes. Good luck with your abs and your English!)