exertion
https://gyazo.com/b459f3cebbfb89b62312f59e0e5a23de
source: [次元が違う・・・!!|無料GIF画像検索 GIFMAGAZINE 3882670] noun
e.g. she was panting with the exertion
e.g. a well-earned rest after their mental exertions.
(権力などの)行使, 発揮
e.g. the exertion of authority.