club activities; extracurricular activities
Typically refers to school-based clubs (sports, culture, etc.) that meet after class. Often contrasted with 部活, which implies more intensive, competitive club participation.
See also: 部活
I have club activities after school.
彼はクラブ活動でテニスをしている。
He plays tennis in his club activities.
Many students take part in after-school club activities.
He plans to continue his club activities in high school too.
Mr. Tanaka serves as the advisor for the soccer club's activities.
She learned the importance of teamwork through club activities.