Exploit the overload before the defence recovers. Run at the defenders to commit them, pass only once a defender is fixed, keep the tempo high, and finish the move at the back post.
On the attacking half of a futsal court with a keeper, three attackers break on two defenders. The central player drives at the first defender to commit him, then releases wide. The winger attacks the last defender and squares across the box for the back-post runner to finish. Keep the pace high, the defence needs only a few seconds to recover. Restart with a new break each time and rotate roles.
A 3v2 in futsal lasts about three seconds. On a full-size pitch a numerical advantage survives a slow pass, a heavy touch and a moment of indecision, because the recovering defenders have forty yards to make up. On a court they have eight. A hesitation here is not a lost yard, it is the whole advantage.
That changes what you coach. The instruction to run at a defender before passing is the same as anywhere, but the window in which it works is far shorter, so the carry has to be direct and the release immediate. Carrying at a defender to see what he does is an outdoor luxury. On a court the decision is made by the second touch.
The pass goes into the runner's path rather than to his feet, and this matters more in futsal than outdoors. A ball to the feet asks for a control touch, and a control touch on a heavier low-bounce ball takes marginally longer, which is long enough for the recovering defender to arrive.
Target the back post. The goal is small and the keeper covers the near side well from close range, but he cannot protect both posts on a court this narrow when the ball arrives across him. A square ball to the back post is the highest-percentage finish available in this situation, and players shoot from the near side instead almost every time.
Worth saying plainly: most of these breaks will not produce a goal even when executed well, because two organised defenders in a small space are a real obstacle. Judge the decision, not the outcome.
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.