Turn defending a corner into a goal. Head it clear, break at speed with the first thought forward, and finish the counter before the opponents recover.
The opponent takes a corner with numbers in the box. A defender heads it clear, a breaker collects and drives, and the team counters against the players left back to finish at the far goal. Emphasise the first pass or carry going forward, runners breaking the moment the ball is won, and finishing before the recovery. Rotate who defends, who breaks, and who is left back.
A team defending a corner is looking at the most exposed shape its opponent will show all match. Six or seven attackers are inside the penalty area, their full-backs are usually in the box too, and often only one or two players are holding position outside. If the ball is cleared properly, the defending team is attacking a defence that barely exists.
Most teams throw that away, and the reason is the clearance itself. A header that goes fifteen yards and stays central lands among the attackers who have just arrived, and the corner simply continues. A clearance that is high, long and towards a touchline gives a breaking player something to run onto and puts the ball where recovering attackers cannot reach it.
The second failure is hesitation. Players who have just defended a corner have been concentrating on the ball in the air, and there is a natural pause after winning it while everyone works out what has happened. That pause is the counter. Somebody has to be moving before the header is even made, which means a designated outlet who does not defend the corner at all, or who breaks the instant the ball is struck rather than the instant it is cleared.
The first pass or carry should go forwards, up the pitch, without exception. Recycling sideways to keep possession is a reasonable instinct in open play and completely wrong here, because the advantage decays within about four seconds.
Against a team that leaves three players back at corners, this is far less available, and that is worth checking before building a plan around it.
Save it to your private drills, then change the animation, adjust positions, swap equipment, or drop it into a session block. Or start from a blank pitch and build your own.