Country singer Tim McGraw is geared up to release a new book entitled "Grit & Grace: Train the Mind, Train the Body, Own Your Life." McGraw wrote about his weight loss transformation and all the grit it took to get there.

However, the book and his weight loss could not have happened without Grace -- his 22-year-old daughter.

Remember Dallas in Four Christmases?

McGraw was unrecognizable in "Four Christmases" (2008). McGraw took on the role of Dallas, the immature young brother of Brad (Vince Vaughn).

Tim reportedly packed on almost 25 pounds for the role he interpreted as a "little overweight, kinda backyard, and having-a-few-beers" kind of guy. He ends up being "the fat guy on the set."

Here's how he looked like then at 215 pounds:

Grace Comments on Dad as 'Dallas'

When the film was released, his eldest daughter, Gracie McGraw, noticed he looked 'big on set' and added, "Geez, Dad. You really need to do something."

It turns out, that was exactly the motivation Tim needed to start shedding the pounds. He went to the gym the very next day, Country Living reported.

The father-of-three admitted that his weight gain was more than just packing on the pounds for a role. He revealed that his lifestyle back then included extra beer with the band and eating cheeseburgers late.

McGraw also opened up about not sleeping well, hitting the sack at 3 o'clock so he could not hit the gym in the morning. Tim began walking every day in the morning and eventually gained stamina to go running. The 52-year-old shared his joy over being at his age, at his "best shape" and "still at the top of [his] game."

The workout routine he turned to now includes a yoga flow known as Infinity and sumo-stance squats -- which are known to tone legs like Beyonce's.

While McGraw stopped drinking alcohol entirely, ditched truck-stop foods and committed to fitness, he cannot seem to let go of his favorite meal: cheeseburger. However, he now tries to earn cheeseburger as a reward by putting in a little extra work.

The Ripple Effect

Tim took to Twitter to share how weight loss affected his life overall.

He considers his body transformation to have benefited his sleep, as well as how he relates to others. McGraw also told Men's Health how keeping fit has helped him sing better. He revealed how he now has a stronger voice as he gains more control over his body.

Watch out for Grit and Grace book launch on November 5.