Are they struggling with handling to get the ball to a gap?
Struggling to get them to run good lines into space?
Want to work on push once an attacker has broken the line?
This drill which you can advance to include a full back for push through the line and finally into a small sided game will give you a way to work on those specific items plus more and it also allows you to challenge even more advanced players.
This one is a PDF that you can download, print out and take to the session with you including all the key coaching points etc.
Please let me know if it works for you and if you advance it even further or have similar drills that you use then we can include them on any update.
Finding the space session plan can be downloaded by clicking the link.