Technically correct front pirouettes on the horizontal bar or the uneven bars must be completed by the vertical or even slightly before.  Kicking up with an undergrip short of reaching a complete vertical handstand performing a front pirouette  and falling over flat in overgrip  lend the athlete valuable understanding and experience about how to begin an early pirouette ahead of the body reaching the vertical line.  The drill also helps the athletes to train their body weight transfer actions  so their front pirouettes finish totally square, not tilted or swinging down crooked.  When the gymnast kicks up at the same time that the arms support moves on the pirouette direction, the rest of the body from the feet down must move together with the arms and shoulder support.