I'm with Andyebs, training is helping to literally save my life. Not just physically, but mentally. And even professionally.
I too had a history with partying and drugs. Never one to be outdone at a party, just plain stupid stuff.
This gets a little personal.
One night I was so sick, so weak, I couldn't pick myself up off the floor. I had no strength, my body hurt, and I was depressed mentally. I sat on the floor for hours until someone came home and helped me to my bed.
I woke up the next day really determined. I hyperbolically thought I was gonna die the night before. So I decided I wasn't gonna allow the bad living beat me so easily. I cleaned up and started working out.
It wasn't easy at first, and I've had complications with my body, but it's saved my life, made me healthy.
But even more, it has kept me out of trouble and focused on school. I don't think I'd be almost done with Graduate School, if not for lifting weights.
It's meant a great deal.