Two players are blocking the ball.
It is called blocking.
Hitting(spiking), blocking, serving, passing, setting( the second touch)
When one or more players stop the ball before or just after it crosses over the net.
you have to be strong to get the ball back over the net whether you are serving, hitting, setting, blocking, or passing
Holding is a football term, not volleyball. The volleyball equivalent of a holding is a lift, which is when you lift the ball up or push it away instead of bumping, setting, blocking, or attacking.
Penetration is a term used in volleyball in relation to blocking. To penetrate means to reach over the net to the opponent's side of the net when blocking, versus just jumping straight up. You jump up, and as soon as your hands are over the top of the net, reach over the net to penetrate into the opposing team's side.
Effective but less intensive volleyball drills are different blocking drills and have a 70% rule where you practice until you get 70% of the shots. It's repetitive but easy going.
"Screening" is when the opposite team is serving and has its hitters, or offensive players, at the net and purposely blocking the other team's view of their server.
You should jump straight up when blocking in volleyball, so you don't end up jumping into the net. However when hitting, sometimes it is good to allow room to jump forward a bit to propel the ball forward and down.
You can't have an ace when blocking. Aces only happen when someone serves the ball and either a player on the other team cannot touch the ball in any way or touches the ball one time and a teammate cannot get to it and put it back in play therefore there is no way a block can be an ace.
Yes, there is volleyball at the Olympics but it is only beach volleyball.