Simone Biles and Jade Carey of The United States both compete a combination tumbling pass with the Silivas. The Silivas is a floor exercise skill named after the iconic Romanian Gymnast Daniela Silivas. This skill is rated H making it one of the most difficult floor. skills in WAG. The Silivas alone was pretty rare until the late 00's early 10's. It's more common today but Simone and Jade are the only gymnasts to compete this extremely difficult skill in combination. They are both Olympic floor