Before revision: Hysterical strength refers to a display of extreme physical strength by humans, beyond what is believed to be normal , usually occurring when people are in , or perceive themselves to be in life-or-death situations.
After revision: Hysterical strength refers to a display of extreme physical strength by humans, beyond what is believed to be within their capacity - usually occurring when people are in , or perceive themselves , or others, to be - in life-or-death situations.