If you are the player in the middle blocker volleyball position, what you block, will depend on what your coach has told you and the other players on your team in your pre-game strategy meeting or during the scouting session while your team was watching video of the opponent.
You follow whatever offensive plays and defensive blocking strategies the coach has established for stopping a particular hitter at the net or for neutralizing a particular team's attack in your back row.
Let's say your coach hasn't established any specific blocking strategies in the game plan then the area of the court that you decide to take away from a particular hitter is determined by the indications you " read" or "see" them do and what you have noticed about that opposing hitter's tendencies.
In the middle blocker volleyball role, you need to remember what an opposing player has been able to do effectively during the match.
You want to keep that in your mental toolbox and pull that information out to use when you go up to stop an attack hit at the net.
You might be thinking ... "Okay here she comes again, what did this chick do last time?
Oh, that's right she tried to hit cross court on me. The last time she did that I could tell because she really opened up her hips during her spike approach towards my cross court.
If she does that again I know she's probably going to hit cross court again. I'll be ready for her this time!"
Things to consider, ask yourself...
You need to remember how and where a hitter has been able to score points against your team during a match, so you can help form a plan which stops the hitter from being so effective.
Once you've decided which area of the court to take away from the hitter, stick with your plan!
You can't block everything at the net. You have to stay focused and disciplined and follow through with what you said you were going to do or what the team decided to do.
If you are going to block a certain hitter cross court then you need to do that even if in the middle of her hit she shows you something else.
Your attempt to take away everything, really means that you haven't decided on any specific part of the court to take away from the hitter with your block, so in the end you will be taking away nothing.
You will just give the hitter a target to hit at with your hands.
For a player with the middle blocker volleyball position assignment remember that you just can't cover everything at the net because the front row defensive players are working together with the back row defensive players.
If the front row is taking one area of the court away, then the back row is depending on them to follow the game plan and to do that in each rally until the coach decides to change the game plan. .
When you set up early and take only one area, whether cross court or line, then your back row players on defense will be able to understand easier and faster what other areas of the court to cover behind your block.