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Over 1 million viewers have already seen the video and many have commented sharing how much they've loved the video clip.

\"This made my day,\" wrote one commenter.

\"I will NEVER get over this video it's my Christmas gift this year,\" another added.

\"i'm about to cry he's adorable,\" someone else replied.

Pettit, who lives in Hawaii but has been visiting her grandfather in New Jersey for the holiday season, told \"Good Morning America\" on Friday it was her idea for the fun video.

\"PHOTO:
Courtesy of Grace Pettit
PHOTO: Both Pettit and Ryan say they share a close relationship.
>

\"We were just sitting on the couch, hanging out, and I kind of was like, 'OK, let's do something. We're both not doing anything.' And then I forced Gramps to get up and make this video,\" Pettit told \"GMA.\" \"We obviously had no idea that people would like it so much.\"

Both Pettit and Ryan said they share a \"very close\" relationship.

\"PHOTO:
Courtesy of Grace Pettit
PHOTO: Pettit and Reynolds visited Ireland together over the summer.
>

\"Grace is a lot of fun to be with. She keeps me young,\" Ryan told \"GMA.\"

Pettit added, \"It's a lot of fun to have somebody like Gramps in your life. He never fails to make me laugh.\"

The duo said they didn't expect their TikTok to resonate with so many online.

\"He's still in shock,\" Pettit said of her grandfather's reaction. \"It doesn't make sense to either of us, but as long as people are smiling.\"

\"I'm amazed. I couldn't imagine it would be that interesting to anybody,\" Ryan said.

But the retired ship broker did see the humor in his \"fit check\" clip.

\"The thing I thought was funniest about the video is when I didn't hear her say goodbye and I repeated the whole thing. I thought that was hilarious,\" he said.

\"We're happy we could make so many people laugh and you know, it was just something fun for us to do and we're glad other people saw it like that,\" Pettit added.

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