Allocate 1 defender per 1.5 - 2 pairs (e.g. 3/4 pairs=2 defenders, 5/6 pairs=3 defenders). If 3 pairs, restrict playing area to 1/3 otherwise use 2/3.
Pairs must perform double plays together anywhere within the playing area.
Use preliminary moves to find space
Make a rule that passes must be at least 2m, to give defenders a better chance.
Enforce held ball rule
Defenders use three stages of defending to effect a turnover. Any pair is fair game, so pairs need to use peripheral vision to scan for defenders ready to pounce.
If a turnover applies, return the ball to the pair and they restart. Continue for set period of 60-90 seconds.
To make it fun, count the number of turnovers a defensive unit effected - highest score wins
Another option is to gradually build intensity is to start with just 1 defender, then every 15 seconds introduce an additional defender from sideline.
Reduces drill intensity for novice teams
Take time to reflect on what caused turnovers; rotate defenders and restart.