I agree with David. This is a very delicate matter. If you say just one sentence too much it can result in the other person's putting their shutters up and wishing they hadn't entertained the subject.
Fortunately the name Natural Stress Relief allows one to answer any questions in down-to-earth vocabulary, without having to explain "meditation" and all that such a term might evoke in someone's mind. I've found too that when one promotes something like meditation and how it has improved one's own life experience, people are quick to find some aspect in your life that shows that you are not perfect, and that this 'thing' you do doesn't work all that well. Somehow, improving one's own life - compared with how it was before - gets interpreted to mean you're saying you're better than others. And that makes you, and also what you stand for, fair game.
When it comes to evangelism with TM, for example, I've been there and done that. It's sometimes hard not to talk enthusiastically about it. But in my own experience, those who will learn the technique will learn it, and those who won't learn, won't, no matter how much one tells them how good it is. All one can really do is answer any questions, and stop at that, without taking the gap to give more than what is asked. Then, as David says, if someone shows real interest, give them the NSR URL and let THEM take the action to find out more about it.
As a my friend always says: LIM -- Less Is More.
Gavin, TM meditator
Cape Town