Definition
To reach a point of physical exhaustion during a run, exercise, or competition where one feels unable to continue.
遇到极限（运动时）
After a few hours of intense work, I really hit the wall and couldn't focus anymore.
经过几个小时的激烈工作后，我真的撞墙了，完全无法集中注意力。
In a marathon, many runners hit the wall around the 30-kilometer mark, feeling completely drained.
在马拉松比赛中，许多跑者在大约30公里处撞墙，感到筋疲力尽。
She pushed herself too hard at the gym and hit the wall, having to stop exercising.
她在健身房里过度锻炼，结果撞墙了，不得不停止运动。