Vigor and vitality
This is used to describe something as full of energy, vigor, or vitality
Positive
奥运精神使中国人更加朝气蓬勃,尤其是年轻一代 | Àoyùn jīngshén shǐ zhōngguó rén gèngjiā zhāoqìpéngbó, yóuqí shì niánqīng yīdài
The Olympic spirit has invigorated the Chinese people, especially those of the younger generation
[Source]
同学们朝气蓬勃地投入到了训练中 | Zhè qún zhāoqìpéngbó de háizi zài cāochǎng shàng kuàihuó de pǎoláipǎoqù
This group of lively kids is happily running about the playground
[Source]
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This is an HSK chengyu
《一二九运动的伟大意义》(Yī Èr Jiǔ Yùn Dòng De Wěi Dà Yì Yì), a speech made by 毛泽东 (Máo Zé Dōng)
This chengyu is from a line in the work listed in the "Origin" section above