PHOTO Tim McGraw shows off six-pack abs after 40-lb. weight loss

That Faith Hill is one lucky lady! Husband Tim McGraw showed off his six-pack abs in a Twitter picture on Monday.

Tim shared the picture on Twitter, saying he was spending his St. Patrick’s Day at the lake with a water jet pack — which requires users to employ abdominal stabilization abilities. Doesn’t look like that was a problem.

The country music superstar’s six-pack is particularly impressive considering he was better known for another kind of six-pack for many years.

“I drank a lot from my point of view and I needed to stop,” he said last year of giving up alcohol in 2008. He also got serious about working out around the same time. He credits that combination to helping him lose 40 lbs.

^ Tim McGraw before and after weight loss.

Now 46, Tim told ABC News last summer he’s an avid practitioner of CrossFit. He also eats a high-protein, low-carb diet — with occasional exceptions.

“A couple times a week, I have to have a cheeseburger or pizza. And I love bread,” That’s the hardest thing to lay off of: bread and butter.”

Hey, if it works, it works… And it looks like it’s working!