Calling mine and yours
Coaches teach pairs to call every shared ball early and clearly: mine, yours, or leave it. One short word, said before the ball arrives.
Trin 1
A lob drops between the two of you at the net.
Trin 2
The player best placed calls mine early and moves to the ball. The partner hears it and stays out of the way.
Trin 3
The caller plays the overhead and the partner fills the space that has opened up.