Rucking is the strategy of attacking the same defender or defensive channel repeatedly across multiple touches. It is not a one-touch play. It is a pressure campaign that uses several touches in a row to wear a specific weakness down.
The principle is simple. Defenders get tired, get frustrated, get out of position, and start missing reads when they are hit again and again at the same point. By repeatedly running at the same defender or through the same gap, the attacking team forces accumulating fatigue and accumulating decisions on that one player. Eventually the defender steps wrong, mistimes a touch, or loses connection with the line — and the break comes.
It works best against the weakest defender on the field. Often that is the slowest player, but it can also be a defender who is out of position, who is hesitant, or who is still recovering from the previous touch. Identifying that defender early in the set is half the work.
Rucking is not just attacking the same body — it is attacking the same channel. The team might cycle through three different runners, but they all target the gap between the same two defenders. The defender being rucked does not have to be the one tackled. The channel is what is being broken down.
The most common failure modes are rucking the wrong defender (a strong defender will hold up against repeated attacks all match), telegraphing the play so the rest of the defense slides to cover, and giving up too early — rucking often needs three or four touches in a row before it produces a break.