What is fistball?

Fistball is similar to volleyball. Two teams face each other in opposing hemifields. Every team consists of 5 players who try to push the ball with their arms or fists into the other teams field. The fields are separated by the a netlike string at the centerline.  The net is stretched between two poles which can be up to two meters in height. Neither the ball nor the players are allowed to touch the net or the poles.