As fundamental rules, we have to take into account the route of the defensive players, allowing them or not, to cross through the delimited space to defend the action, although they can not intervene the ball in the delimited area. If, on the other hand, we choose not to allow them to invade the intermediate space, the exercise is more demanding and the rules that condition it are more in line with the objectives. We can delimit with 4 pikes the interior space, to make it easier to determine if the forbidden zone is invaded.