This video shows a roundoff flashkick performed by Song Long Yong from the Song Jiang Wushu School. You can jump off like for a moonsault or a backflip layout and then spread the legs. The landing can be kinda tough for the ankle ( becasue one lgs touches the floor first ), so try this with landing mats first and make sure you don't relax your abs too much when you land. This flip is popular in wushu, capoeira and extreme martial arts ( tricking ). Most gymnasts don't practice flashkicks.