Tim McGraw is in the best shape of his life -- now that he's quit drinking.

He tells People magazine, "I drank a lot from my point of view, and I needed to stop. I felt quitting was something I needed to do. I didn't feel I had any moral high ground with my kids in the long run."

Tim replaced the bottle with an intense workout regimen and has an impressive eight-pack to prove it. He says, "Working out is a great way to go out on stage. When I hit the stage, my adrenaline is going and I'm ready."

Tim releases his album Two Lanes of Freedom on Tuesday and hits the road for a 30-city tour in the spring.