Recently I have watched some recorded volleyball games featuring the Brazilian men's national team. I noticed that frequently - in nearly every set I have watched - they substitute one or two players after approximately half the set has been played. The player(s) that came in are resubstituted after only a few - sometimes less than five - points by the original players.
This seems to be so common that the TV commentator was saying things like "the usual Brazilian substitution is coming early this set". However, he didn't give a rationale for this kind of substitution. So what is the team trying to achieve by such a substitution pattern, especially when it is obviously done in a majority of sets played?
For avoidance of doubt, I'm not talking about the libero replacement, but about the substitution of one "regular" player for another.