This is the 9503rd most frequent Turkish word.
aktivitesini
"Her/his/its activity."
Here, 'aktivitelerini' is used to refer to a range of group-related activities.
Rekreasyon alanında yapılan spor aktivitelerini gözlemledik.
We observed the sports activities conducted in the recreation area.
In this sentence, 'aktivitelerini' pertains to actions conducted by children as a group.
Çocukların sınıfta gerçekleştirdiği eğitici aktivitelerini beğendim.
I liked the educational activities the children performed in class.
'Aktivitelerini' in this context addresses the personal endeavors or events related to an individual.