Looking at photos from before his physical transformation some six years ago, country music superstar Tim McGraw really can't believe how far he's come. 

Man, my gut!” McGraw says in the latest issue of Men's Health. “I was up there in a see-through shirt – I thought I was lookin’ good!”

At 47, McGraw is now in the best shape of his life - a radical shift he says is all thanks to the intervention of his wife Faith Hill.

“When your wife tells you it’s gone too far, that’s a big wake-up call,” McGraw says, “That, and realizing you’re gonna lose everything you have. Not monetarily, not career-wise, but family-wise.” 

Beyond drinking and partying, McGraw shared that he was also starting to get involved in some other dangerous habits. 

"Up until seven years ago, there were not a lot of shows that I didn’t have something in my system," he admits. 

Fast-forward to today and McGraw now has a body fit for the superhero scene. He's lost 40 pounds, gained 8-pack abs, and changed up his diet for greater energy and health. 

“We work with pulleys, bars, and do core training, strength and balanced movements to build up the muscles between the ribs and connective tissues,” McGraw's trainer Roger Yuan told People. “I have trained a lot of people and many are hard workers. But Tim is another animal. I have to rein him in and have to tell him, ‘You can’t do that much.’ There is no quitting him.”

According to sources, McGraw is reportedly following the paleo diet - which focuses on organic proteins, healthy fats, non-starchy vegetables, and excludes sugar, processed foods, and dairy. A typical dinner might include grilled salmon served with asparagus and lightly fried polenta slices. He also likes to indulge in the occasional cheeseburger, but admits such treats are kept to a minimum. “I like to eat. I like food. That is one of the reasons that I throw that extra hour of working out in," he says. 

All of this adds up to a training routine that's beyond what most of us might pursue: 90 minutes, 3 times per day. 

"I'll be the first to admit I take it to extremes," he tells Men's Health. "'I'm not one of those people who can sorta half-ass something."

The latest issue hits newsstands on June 24th. 

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