Actress Catherine Zeta-Jones has found a new way of staying fit and toned - hula-hooping.

The Oscar-winning Chicago star reveals she picked up a hoop from a convenience store and decided to show off her skills to her kids - and discovered it's a great work-out for a 40-something mum.

She showed off her talent during a recent appearance on The Ellen DeGeneres Show in America, telling the host, "When we were kids, we didn't have all the gadgets that my kids have and all the stuff... It's become a bit of a thing... It's really good for your core muscles."