Even out of the Olympics, it Involves a hop, skip (step), and a long jump.
If your asking how good you have to be in the Olympics, then the answer is they have to have a sub 11 second (its helps...
It is a push and a pull. When you move your body towards the ground, it is a pull. A pull as in a pull to the ground. It is a push when you are moving away from the ground.