Futsal compresses soccer's essential skills into a small box; it places players inside the deep practice zone, making and correcting errors, constantly generating solutions to vivid problems. Players touching the ball 600 percent more often learn far faster, without realizing it, than they would in the vast, bouncy expanse of the outdoor game (where, at least in my mind, players run along to the soundtrack of Clarissa tootling away on “The Blue Danube”).