San Ramon, CA — 24 Hour Fitness kicked off its 12 Million Lives campaign by airing its first TV commercial during a recent FOX broadcast of “House.”

Six 24 Hour members from a variety of backgrounds are featured in the campaign, which is supported by the Web site (The company says it has helped more than 12 million members in its 25 years.)

The amount of money 24 Hour spent for the campaign was not disclosed. reported last month that 24 Hour spent $25 million on media in 2006 (excluding online) and $17 million in 2007.

24 Hour has advertised on national cable TV before, but the new campaign is a first for network TV, a 24 Hour spokesperson says.