Supreme Court justice and exercise extraordinaire Ruth Bader Ginsburg invited Stephen Colbert to join her during a recent workout, during which the two engaged in everything from leg lifts, tricep extensions, and an important meditation on whether a hot dog should be rightfully considered a sandwich. (By the definition Colbert provided, Ginsburg ruled that the hot dog is, indeed, a sandwich.) The segment revealed a number of insights into the 85-year-old justice, including her fondness for opera during workout routines.