生気を

vitality

→ 生気
phrase Rare #39,279
vitality 生気 means vitality, liveliness, or life force; を marks it as the object of a following verb, such as 吹き込む (breathe into), 取り戻す (regain), or 奪う (take away).
JA: 音楽が部屋に生気を与えた。
EN: The music brought vitality to the room.

彼らの生気を奪って若さを維持している思われた吸血鬼の話はそれが起源

That is where the story of vampires who were believed to maintain their youth by draining people’s life force originated.

— ザ・マン・フロム・アース (2007)

その新人チームに新たな生気を吹き込んだ

The new recruit breathed new life into the team.

花はあと生気を取り戻した

The flowers came back to life after the rain.

一休みしたら彼女は生気を取り戻した

After taking a short break, she regained her energy.