Jay Leno put Vince Vaughn to work earning his plug for his new movie, 'Couples Retreat.' Vaughn was forced to work out at the hands of 95-year-old fitness icon Jack LaLanne.

"Now Jack, I want you to whip this candy ass into shape!" Leno said.

LaLanne coached Vaughn through a series of dips on a metal chair, which he executed gamely then kissed the old man on the cheek.

'Couples Retreat,' in which Vaughn plays a happily married man on vacation with friends who are trying to save their marriages, opens October 9.