To begin the backhandspring the gymnast leans back off balance while slightly bending the legs and moving the trunk forward with a straight or hollow chest.  From this position the gymnast can make a powerful jump backwards.  Back handsprings have two important flying phases.  From feet to hands  then from the hands back to the feet.  /Still 1/ Hollow Chest.  /Still 2/  Trunk forward with body leaning back off balance.  /Still 3/  Long arch first flying phase.  /Still 4/  Short and deep hollow second flying phase.