Action
Activity
noun, verbal noun
The lively moves you make are actions. They're the activities you do every day to stay fit and healthy!
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
私のガールフレンドは、週末はコスプレイヤーとして活動しています。
My girlfriend is an active cosplayer on weekends.
この火山はもう何年も活動しています。
This volcano has been active for many years now.
活動動詞とは動詞を相の観点から四つに分けた内の一つです。
Action verbs are one of the four verb types categorized from the aspect perspective.