Sam keeps in great shape, but he's not sure that's going to help him much.
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"The workout I love, but the mobility and the ability to keep a dance move I'm not sure about," he said.
He does have some dance experience.
"I used to love to dance at the high school dances, and there's in my senior yearbook there's a picture that says 'best boogier,'" he said.
Sam will be dancing with one of the most experienced professionals: Cheryl Burke.
MORE: Tyra Banks returns as host of 'Dancing with the Stars' on Disney+ with new co-host Alfonso Ribeiro
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During a recent interview, Sam asked Cheryl what it takes mentally and physically to win the coveted Mirror Ball.
"To not think about bringing home the trophy, because the journey is the most important thing," she said. "It's not the ending result. It's about how you get there."
Sam Champion joins cast of 'Dancing with the Stars' season 31
After his appearance on "Good Morning America," where we learned he would be dancing, Sam shared his first reaction to learning he would be on the show.
"Fear," he told Sandy Kenyon. "It really was, because you make a quick assessment of yourself and you're like, 'Can I do this? Is it physically possible for me to do this?'"
MORE: Check out the full list of celebrities competing on "DWTS" season 31 and see the partner photos
"Dancing With The Stars" season 31 premieres at 8 p.m. Monday on Disney+.
Voting opens Monday at 8ET/5PT and closes after the final dance, so make sure to stream -- and yes, there will be an elimination the first night.
Sign up for Disney+ now to get 1 month for only $1.99 through September 19!
A subscription to Disney+ costs $7.99 per month or $79.99 per year, and a bundle consisting of Disney+, Hulu and ESPN+ costs $13.99 per month.
The Walt Disney Co. is the parent company of this ABC station.
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