Two players competitively practice their serve; inside each service box, there are targets: down-the-T, middle, wide, and short wide (see graphic below).
In the beginning one of the servers picks a target. They take turns serving and aiming at that particular target (cone) until one of them knocks it down.
The player who hits the target will nominate the next target and the game continues until all the targets are hit.
Great game for accuracy when serving, which also brings some fun and creativity in practice.
Recommended for advanced-level players.