Definition
To reach a point of physical exhaustion during a run, exercise, or competition where one feels unable to continue.
遇到極限（運動时）
After a few hours of intense work, I really hit the wall and couldn't focus anymore.
經過幾個小時的激烈工作後，我真的撞牆了，完全無法集中注意力。
In a marathon, many runners hit the wall around the 30-kilometer mark, feeling completely drained.
在馬拉松比賽中，許多跑者在大約30公里處撞牆，感到筋疲力盡。
She pushed herself too hard at the gym and hit the wall, having to stop exercising.
她在健身房裡過度鍛鍊，結果撞牆了，不得不停止運動。