Reebok has withdrawn a controversial ad campaign telling gym visitors to cheat on their girlfriend rather than on their workout.

Reebok spokesman Kerry Summers told The Associated Press in an email Friday the company apologizes for "any offense they may have caused" and that the company "does not condone this message or cheating in any way."

Summer said the posters – "Cheat on your girlfriend, not on your workout" – were placed in men's and women's locker rooms in 85 of the brand's partner gyms across Germany for two weeks.

(Photo courtesy of The Daily Mail, Youtube)

Radar Online obtained a letter to Reebok from Cheaterville.com, a site that calls philandering partners online, which urged a boycott of the brand, a MailOnline.com article said.

The letter read: 'This form of advertising shows a dishonest and disrespectful attitude towards women and your company should be ashamed to have even placed this ad in various places thinking it would be perceived in any other way.'

The incident comes while Reebok showed a drop in sales for the fourth quarter compared to the previous year, MailOnline.com said.