Shawn Levy: We spent darn near four entire days, ten to twelve hours each, inside a tiny stage – that gym/sauna (set) was not one inch bigger than the real thing. We had six actors and another hundred crewmembers. It was tight. It was hot. We probably did well over a hundred plus different angles to tell that story right. I shot the entire sequence with two handheld cameras for maximum energy and messiness. Millie and Dacre, two of our most powerful actors, came ready to crush it. So the intensity level was really high. At the end when Eleven collapses, exhausted, into (boyfriend) Mike’s (Finn Wolfhard) arms, that was real exhaustion.