Russian Reflexive Verbs with the Instrumental Case

Did you know that there are many reflexive verbs that are used with the Instrumental case (not all of them)? Three important verbs, used with the Instrumental case, are интересоваться (to be interested in), увлекаться (to be fond of) and заниматься (to be busy with, to be engaged, to study something, to work on something).

For example,

Я интересуюсь футболом. I am interested in football.

Он увлекается живописью. He is fond of painting.

Я занимаюсь русским языком. I study Russian.