pep talk

pep talk
talk intended to improve morale, esp by encouraging the listener(s) to work harder, try to win, etc 鼓励的话; 激励的话
    The team was given a pep talk on the morning of the big match. 运动队在大赛当天早晨听了一次鼓舞士气的讲话.

牛津英汉双解词典