Sprint action when the starting

Actions in place?
Hold with both hands on the ground in front of the starting line, and then turn on the forefoot and rear foot on the starting blocks after knee knees, raised his upper body, the hands shoulder width or slightly wider near the starting line along the support, the neck of natural , head and spine with a straight line, seeing the starting line of the runway prior to 0.5-1 meters.
Preparatory Action:
After the hearing prepared to order quickly and not nervous once carried a hip due to height. Is usually slightly higher than hips shoulder, so that legs knee to a right angle: 90-100 degree angle for the front legs, hind legs to 120-130 degrees.
Action start:
After hearing gunshots, his hands quickly off the ground, put his left arm and bend the front, bending the right arm swing, right leg doing a short fast after kicking the starting blocks, before the swing leg quickly