Late night comedian Jimmy Kimmel will celebrate his 1,000th episode of Jimmy Kimmel Live tommorow night (Thursday). And what better way to celebrate an anniversary than “Sweatin’ to the Oldies” with fitness god Richard Simmons. Check out these shots of Jimmy and Richard on the set of their new parody!

Jimmy Kimmel Live will air a 90-minute anniversary special, beginning at 11:35 p.m. on Thursday night on ABC.