"Some films feel like a relay race, passing emotional weight around a deep ensemble. Others hinge on a single performer asked to do almost everything, holding attention through long stretches of solitude, stress, or silence. A camera can follow one face for hours, relying on small shifts in breath, posture, and timing to keep the tension alive. Supporting characters may appear briefly, yet the story's pulse stays locked on one person's choices and endurance.
These movies often demand unusual stamina, because momentum has to come from internal conflict as much as external plot. Stakes can be physical, psychological, or both, and the actor's presence becomes the engine that drives every scene forward." - midlifehealthyliving.com