The aim is for the jammer to help their offence help them.
Groups of 3: There will be one jammer, one blocker and one offence. Have the jammer draw the blocker to the edge of the track, allowing for the offence to swoop in and block the blocker. This prevents them from continuing to block the jammer.
This requires the jammer to communicate what they want their offence to do - having hand signals or code words in your team can help with this.
The offence can block by driving the blocker off track or positional contact, trying to maintain as much contact with that blocker as they can.