Have 2 defence (red) set up between cones as shown, these defenders will only be able to move side to side
Have 3 people on offence (blue) set up in a line across like shown
Have a handler (blue 1) and someone as a mark (red 6)
Give 6 throw attempts for them to throw between, or around the defenders to sucessfully get it to one of the offence behind. Get them to try fakes to make the defence move to create an opening to throw.
The defence will have to work together in attempt to block any throws, they shouldn't be scared to dive.
Give 6 throw attempts, then rotate new people in