This way , the ball is always in play , obsoleting all out - of - bound rules .
The entire field is surrounded by a one - metre - high wall or fence , out of which extends a net for a further four metres upwards .
This way , the ball is always in play , obsoleting all out - of - bound rules .
The entire field is surrounded by a one - metre - high wall or fence , out of which extends a net for a further four metres upwards .