Volleyball is sort of a hard sport. It doesn’t depend on a lot of running but you do need endurance. zYou also must be strong or get strong physicall and have good reaction time. Sometimes you have to mix that with critical thinking too. Trust me it is very hard in the middle of a game when you have to think what to do in the middle of 1.5-2 seconds. You have the essentially ”read” the other player to see hat they are going to do next or where they are going to, in terms of placement. This could mean reading the setter to see where they are going to set the ball. Highly trained setters are more difficult to read, but sometimes not because of their technique. It could also mean hitters, like where they are going to swing and how hard.