Talk show queen Oprah Winfrey is facing legal action from bosses at an exercise company who have filed suit against her Harpo Inc firm over a workout program.

Officials at Unicus Performance Training (UPT) filed a lawsuit Feb 22 alleging they were never paid for developing an exercise scheme for the media mogul's company, reports imdb.com.

UPT bosses claim they were hired by executives at Winfrey's firm to put together a corporate fitness regime, the O Fitness Challenge, specifically for Harpo employees between August 2008 and March 2009.

According to the legal documents, UPT chiefs invoiced Harpo for $63,000 but were told their contract had been terminated after they allegedly violated a confidentiality agreement by sending out a mass email promoting an upcoming appearance on Winfrey's radio show.

UPT owners Dina Castillo and Frank Nunez claim Harpo's general counsel and vice president William L. Becker later told them their services had been 'voluntary'.

Castillo and Nunez are seeking unspecified damages 'to compensate Unicus for the fair value of the services performed'.