English to Chinese Other General / Conversation / Greetings / Letters Marathon running

As for the pace, I try to be constant. In marathon running, when you’re training, you just want to push yourself to the wall. Or go right to the edge of touching that wall. It’s nice to know what the feeling is like, so you’re not taken by surprise when it happens.

对其中的“push yourself to the wall”和“go right to the edge of touching that wall”两句都不理解，请教了。