Tim McGraw is incredibly in shape at the age of 46. He is disciplined with his stuff-of-legend workouts, which inspired fear in tourmate Brantley Gilbert. The 'Highway Don't Care' singer recently revealed the key things he does to keep that trim, toned body in tip-top shape.

"You watch what you eat a little bit and try to work out as much as you can," he said. "Try to stay active more than anything."

McGraw tips the scales at around 170 pounds these days, which means he feasts on leaner offerings like oatmeal, chicken and tuna, avoiding beef altogether. It's not that much of challenge for him to stay away from beef, since he admitted he's not a "big beef guy."

Despite note being a beef fiend, he admitted, "I love cheeseburgers. 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."

Carbs -- they're a killer, even for Tim McGraw.

In addition to a largely healthy diet, McGraw is a devotee of CrossFit, which is a strength and conditioning technique comprised of varied, high-intensity movements.

"That's one of my favorite things to do, because I have a short attention span, so I can switch exercises really quickly if I get tired of one," he admitted. Boredom is often a problem for those who work out --or try to work out-- so that seems like a great method for those who find the process uninteresting.

McGraw is such a CrossFit diehard that he has converted his band and crew to the program and he plays one-on-one basketball with wife Faith Hill, killing two birds with one stone by mixing wife time with working out. Brilliant!