These are some helpful progressive skills to introduce yurchenko vaults.  First the gymnast roundoffs to a higher mat.  The roundoff should be landed with the center of mass in front of the feet.  In the next step the gymnast practices roundoffs to rebound on a springboard.  When they demonstrate consistent rebounds, the gymnast can begin practicing some tuck somersaults and eventually layouts and high whip backs. The gymnast hollows too early in this example.  In this better example, the gymnast kept the tight arch position longer, but his head is too far out and his shoulders should be more open.