全て力を最大限使い果たさず、余力を残しておくことが大切。
まだ進めそうでも、思い切って切り上げて次の日の余力を蓄えておく。

Reserve energy
It’s important not to exhaust all your strength completely, but to always keep some reserve energy. Even if you feel you could keep going, make the decision to stop and save your energy for the next day.