I'm thinking that if I hide some magnets in the waste band of my shorts and in a Hula hoop I could break the World record for keeping a hula hoop going because I wouldn't have to rely on centrifugal force to keep the hoop up. The World record is probably hours and it would take a lot of energy to keep the hoop up and spinning but that wouldn't be a problem with the magnets - all I would have to do is move my hips a little bit which wouldn't take much energy so I could last for many hours. Cheers!