Congratulations on taking this positive step. I am a weekend warrior myself - to use a phrase one of our friends have posted- and so I often hit the gym before work in the mornings to shave off the stress. I personally think it's a great idea. You are right to not want to go overboard and risk an injury, but the health benefits and mental positives are all so helpful in recovery. I read once that alcoholics' brains release more dopamine (the "feel good" neurotransmitter) than those who are not wired to be alcoholics. Hence why we overdo it. Exercise is a great way to stimulate dopamine release and feel good without engaging in destructive behavior. I say go for it. Moderation is key, friend, in everything.