About ambition and alertness in training

The other day I was talking to Yi-Chung (益誠) after the training while digging into a huge pile of Taiwanese shaved-ice with fresh fruits on top (hm...), and we spoke of something which was quite interesting. Namely, when you visit another dojo from the one you train at everyday, you tend to be more concentrated, more alert, and more ambitious in giving your all. This alertness or "amibtion" usually makes one perform better than usual. This is why, from time to time, it is good to visit another dojo and refresh the mind.

But why can't we retain the same amount of alertness and be ambitous EVERYTIME when we train?

We should... but it's difficult indeed...