Apparently, a couple of Bradys didn't own any exercise equipment.

Former "Brady Bunch" actors Christopher Knight and Susan Olsen, who portrayed Peter and Cindy Brady on the popular TV sitcom, and four other not-so-A-list celebrities signed up to shed excess pounds for Discovery Health Channel's "Body Challenge: Hollywood," a 12-week health and fitness competition.

"It's not a beauty contest," Knight told The Associated Press Tuesday. "It is a contest about health. It was very illuminating to me. I thought I knew what I needed to know."

The competitors, including Erik Estrada ("CHiPS") and Charlene Tilton ("Dallas"), were given personal trainers and nutritionists to help in their transformation. Knight lost 50 percent of his fat mass during the competition, which was filmed last December.