be filled with vigour;be imbued with vitality; bubble (over) with life;dynamic; full of pep (/life); fresh and vigorous;have a youthful spirit; lively; sappy; spirited
❍ 孙叔叔点点头，看看站在面前的这支～的小队伍，满意地笑了，……(石文驹《战地红樱》116)Sun nodded and smiled with satisfaction at the spirited line-up.
朝气蓬勃
be bursting with youthful spirit;brim over with vigor and vitality;imbued with vitality
朝气蓬勃zhāo qì pēnɡ bó
朝气：新生向上、努力进取的气象；蓬勃：旺盛的样子。形容生气勃勃，充满活力。full of vigour and vitality, full of youthful spirit, bubble over with life