I've had two travel teams improve dramatically playing Futsal. It's much faster played on a basketball size court indoors or out.
Ball goes out of bounds the team has four seconds to restart.
Because the court is smaller than indoor with walls you must recover faster, etc. 2. Tactically it's an fantastic game. The goal arc in front of each small goal is the perfect size. If the keeper comes to the edge of the arc you can't easily score and must look to pass to a teammate to shoot immediately. The low bounce Futsal ball keeps the ball in play and as commented is great for developing skills.