Score from an attacking kick-in. Set a legal block to free the runner, deliver a driven kick-in to his stronger foot inside four seconds, and finish first time before the defence recovers.
Ball on the touchline in the attacking half. The taker calls the routine; a teammate sets a legal block on the marker (body in the path, no arms), the runner peels off it into space, and the taker drives a low kick-in to his stronger foot to finish first time. It must be taken within four seconds. Rehearse both sides and vary the block and the runner.
Four seconds. That is the rule which makes a futsal kick-in a different thing from a throw-in, and everything about how you coach it follows from the count. The referee starts as soon as the ball is stationary on the line, and losing possession to the clock is a turnover you handed over for nothing.
The consequence is that the routine has to be decided before the ball goes out, never negotiated afterwards. That is why a code word matters more here than at any restart in the outdoor game. Somebody shouts a name, everybody already knows which block and which run, and the kicker is delivering rather than looking.
The second rule that shapes it is that a kick-in is delivered with the foot, so it can be driven hard and flat in a way a throw never can. A futsal kick-in is closer to a corner than to a throw-in and should be treated as a shooting opportunity rather than a way of restarting possession.
The block is the mechanism. One player puts his body in the runner's path, the runner delays and then peels sharply off him, and for one second the defender is a body-width behind. Body in the path, balanced, arms in. Arms out is a foul, and in futsal fouls accumulate until they become a ten-metre free kick against you, which is a far more expensive mistake than its outdoor equivalent.
Expect a low conversion rate and coach it anyway. A routine that scores once in eight is still the most valuable four seconds a futsal team gets.
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.