Runners say they "hit the wall" when they are pushed to their physical limits. Usually that means they have difficulty breathing, become anxious, and feel faint. Almost every runner has felt this at some point.
「撞牆期」，是長跑界的專有名詞，指的是選手體能負荷到達臨界點的狀態，通常會出現呼吸困難、焦躁不安、頭暈等現象，幾乎每位選手都會碰過。