The secret to Gwyneth Paltrow’s slender frame has been revealed – she has a daily 180 minute exercise session.

Chef Mario Batali, who teamed up with the Iron Man actress on their upcoming documentary Spain... On The Road Again, made the revelation to Us magazine.

He said: "I think she works out three hours a day - which is one of the keys to success.

"If we all did that, we’d all look like Gwyneth Paltrow. Or at least closer."

He added that the 35-year-old "loves to eat ... and, you know, she never puts on a pound!"

Do you think a daily three hour work-out is excessive? Be sure to leave your comments below.