Instructions
Give your gymnast a running start by repeatedly pressing the "Left" and "Right" keys on your keyboard.
Hit the "A" button on your keyboard just before your gymnast hits the board and press "A" again just after he jumps off of it. This will give your gymnast the extra height he needs to perform a double move.
Press "1" twice while your gymnast is in the air to have her perform a double-front tuck or "Left" then "Right" to have her perform a double Tsukahara. Press the "Down" button on your keyboard immediately after to ensure your gymnast lands cleanly.