One hobby I have is singing. And I know this is one of my hobbies because it brings me joy and I do it often.
One of my hobbies is rock climbing. I love climbing because it all fits together like a puzzle. The moves, heights, and different courses all make me look forward to getting back on the wall.
Another hobby I have is acting. I know this because I am very interested in singing and dancing, and I do it often.
Another hobby I have is reading. I love learning and experiencing what the characters learn and experience.