Groups of 3 each require 1/6 of court space. Trio choose an attacker (A), defender (B) and feeder (C) who is 5m away.
(C) starts with the ball and lobs, making it an even contest between (A) and (B)
(A) and (B) both attempt to win possession
Jump with both feet for maximum height
Tapping the ball upwards to advantage is a method to use if the pass is slightly towards the other player
The player who loses the contest must pressure the passer and make their opponents return pass back to (C) difficult
Repeat for 1 minute, then rotate roles.
Optionally try using bounce passes, although these are more physical.