According to TMZ, a video that has surfaced on YouTube featuring Ultimate Fighting Championship champ Chuck Liddell and his girlfriend Heidi Northcott working out naked was a "a viral campaign for Reebok."

Liddell has a sponsorship deal with Reebok.

The brief video shows Liddell and Northcott doing various exercises in nothing but Reebok shoes. They seem unaware that they are being videotaped.