This is the 3229th most frequent Turkish word.
gençleri
"Gençleri" means "the young people" or "the youth" in English.
Here, 'gençleri' is in the accusative case serving as the direct object of the verb 'teşvik etmek'.
Gençleri spora teşvik etmek önemlidir.
Encouraging young people to participate in sports is important.
In this sentence, 'gençleri' again appears in the accusative case, acting as the direct object of the verb 'gördüm'.
Parkta birçok gençleri gördüm.
I saw many young people in the park.
In this context, 'gençleri' is in the accusative case as the direct object of the verb phrase 'hedef alıyor' and indicates the group being focused on.