Net Rush is a direct rip-off of another Jorge Capestany drill. He calls it Triples. I have taken the liberty of renaming it,and Jorge I hope you don't mind. The game I know as Triples is nothing like this. It features three players per side and is already posted here.
Net Rush is a drill designed to improve a doubles player's ability to play the first ball coming back to them after their own serve. It is a hybrid of Rush and Crush and All Position Doubles. Great for four or more players.
Four players take up regular doubles positions on court. One of the baseline players bounce feeds the first ball and point is played out. Feeding player MUST follow the ball in to the net.
After each point, players rotate positions with net players advancing to opposite baseline.
It's virtually impossible to use an individual scoring method with this game (believe me, I've tried). So probably best to just run this on a timed interval with plenty of coaching in between points.