We all know footwork is very important. There is a technical aspect of it I'd like to discuss, and that is how to get back to central position. Imagine this: you're right handed, stepping forward to the net. Your last step is with your right foot. In doing so, the right leg flexes. Now, to get back into position, do you use that flexed leg to spring back? It would make sense since you'd be using the landing energy to spring backward, just like a recoil, and hence using less energy to get back into central position.