Stephen Colbert Joins Justice Ruth Bader Ginsburg For Her Famous Workout

"I'm cramping."

You don't have to wait until the Ruth Bader Ginsburg documentary RBG is released this May to witness the Supreme Court justice's famous workout routine, because Stephen Colbert got the inside scoop for The Late Show when Ginsburg invited him to Washington, D.C.

The 85-year-old, who has said she has no interest in retiring, stays in shape through an exercise routine documented by personal trainer Bryant Johnson in the book The RBG Workout. Johnson was there when Colbert visited Ginsburg for push-ups and weight work, which quickly had him "cramping."

But before they got started, Colbert had an important issue he needed Ginsburg's decision on — whether a hot dog is a sandwich. "You tell me what a sandwich is, and I'll tell you if a hot dog is a sandwich," she tells him. Her final ruling is based on the precedent set by the sub roll, and it might just blow your mind.

It soon becomes apparent that Colbert and Ginsburg's workout styles are pretty different. Whereas she likes to exercise to the sound of opera, Colbert suggests they play a little C+C Music Factory. "I would never, never exercise to that noise," she says. "Let's shut it off."

See how Colbert fares in the video below:

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