Why in Volley movement of arm

And is that I played to games with balls that wasn't with the football, was if the arms, so the way in the two games after you gonna do without notice, is I learn because I studied with others players and isntructor, is the fingers and pulse have to be firm or gonna be break, the ball of volley is much more lighter than a basket ball or a football ball, but when the ball came for you are with velocity and that is weight and you gonna break your fingers or wrist if the aren't freeze, the fingers give a short cut in the ball to impulse it, but is a short moviment, so you movement very much the arms, also you have to run in the area to catch the balls, so is legs and body, to got a low ball you have almost to got in the knees, and the other game, you sometimes are good if you can intercept a ball that would be of the deaths, who is hit and let the ball fall will be in the game but in the death, in the end is two one of each team running of the balls of the deaths of the other team and the last of the leavings, the deaths are in our backs and the leaving one is in the other side in his area, the deaths are in the back out of the teams areas, I was also good because I jump to catch balls, saved some friend that let the ball fall in don't let the ball hit the floor, and was very impossible of hit me, or jump at the side or I good ball catcher. Rute Bezerra de Menezes Gondim