To build up energy; to conserve strength; to gather one's resources; to lie low and recover one's strength.
经过长时间的训练，运动员们现在需要好好休息，蓄精养锐，为接下来的比赛做准备
After long hours of training, the athletes now need to rest well, conserve their strength, and prepare for the upcoming competition.
Next Idiom