Country music darling Carrie Underwood is working hard to prepare for "game day".

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The singer has been preparing to tour this summer, staying in shape and rehearsing for some big musical numbers.

"I love my at home workouts, but sometimes it's nice to switch it up!" the star tweeted the star July 3. "@BarrysBootcamp Nashville made me sweat today! My abs will hurt tomorrow".

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 Underwood has a lot to get ready for. Earlier this week The Hollywood Reporter announced that the singer will be returning to NBC's Sunday Night Football this fall.

Last year the star wowed audiences with her opening performance of Waiting All Day for Sunday Night. This year, things will be bigger and better than ever.

Underwood told The Hollywood Reporter that there will be a "roaming party-concern" feel to the show with "lots of lights".

"They wanted it to feel really high energy," explained the singer. "I love football. I'm honored they asked me to kick it off. Hopefully when people hear the song, they'll just feel ready for the big game!"

While the singer filmed the number in Los Angeles back in June, it won't air until game day.

On June 25th the star did post a photo of herself all glammed up with those bright lights behind her, but other than that, fans will just have to wait for the fall. With "tweaks" Underwood claims to have made to the number, she hopes the performance will get the crowd fired up for the start of the football season.

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