Stage 1 Layout – your starting 4 defenders on matchday.
Stage 2 Action – Your starting 4 defenders form a barrier like so, should get a set of 4 players to try and make their way to the other side of the pitch, the 4 defenders have the job of stopping them, using the barrier to do so.
Stage 3 – Nice and simple routine to get your defence into the idea of keeping a shape and a line.
https://youtu.be/UHjYhtf_b8Y