What could I say to someone when they ask me "why do you meditate?" I was talking to someone about my morning routine, which includes meditation. They asked me why do I do it. I didn't know what to say. Finally I said "you should find out yourself" with a smile. I don't know how to answer this question. I don't want to explain, don't want to preach and don't want to come off like I'm hiding something by not explaining myself. And it's rude to not answer the question. I felt what I said was not the right way to respond. Suggestions?
Some suggestions:


You might phrase it as an invitation ("you could find out yourself") instead of as an order ("you should find out yourself"); and then if they ask more, try to help with their next question.
You might have a normal reluctance to be preachy; but because in this case someone asked (or invited) you to tell them, maybe it's OK for you to get over your normal reluctance and, instead, go ahead and tell them
You could give a short (one-sentence) reply and then wait for their response: "I do it because (state your reason here)". If the reason makes sense to you then maybe it'll make sense to them too; or if not then they can choose to ask (or choose not to ask) more about it.
You could turn it into a dialog or discussion (instead of being preachy) by adding a question at the end; for example "I do it because (here's my reason). Am I right? :-)"
You could give an less-personal answer: instead of saying why you personally meditate, you could reply, "Actually there are some good answers to that: venerable Yuttadhammo posted a 'top five reasons why everyone should meditate' to Youtube" (alternatively whatever or whoever else inspired you)
You could explain your feelings (which might be like discussing your relationship) with the person: for example, "I don't know how to answer that; I wish I could, but ... I don't want to sound preachy."
You could also turn the question around, "Oh! Why do you ask: do you meditate?" Try to see why they're asking or what they know already (because knowing that might help you to answer them).