A push-pull throttle is a very misunderstood thing. It is a dual cable throttle operation where in the pull cable is what opens the throttle plates. And, the push cable along with a throttle return spring is what closes the throttle plates.
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.
Push factors is when something makes you move out of your country such as the lack of jobs, wars, lack of food, and drought. A pull factor is when something you like is somewhere like good jobs, big...