hobby; indulgence; habit; addiction

Skating is one of my hobbies.

My father's hobby is growing roses.

Honey, quick, quick. There's this website called Tatoeba that's auctioning its sentence collection for a cent each! They've even got special offers like buy 100 sentences and get 1 free! "Ah great! now people collect sentences as a hobby?! What's the world coming to!"

My bad habit is to give money conditionally and to give thanks unconditionally. Yours?

My father's hobby is fishing.