I believe that word-of mouth referrals are still the best way, however, I have gotten inquiries through IDEA FitnessConnect. I believe that this is a great source.
Years ago, I tried an ad in a newspaper (I am in busines that long 🙂 and the only person I got through this medium was the person at the newspaper who I talked to about this ad.
I found that being out in public events, clearly identifiable as a personal trainer, often starts a conversation. A lot of people are curious and may never have met a real personal trainer. Have plenty of business cards handy.
Teaching classes, of course, is another way to connect to people, and I see that you are also a fitness instructor.
Fortunately, I have my own studio and only go to the homes for existing clients if they have a change of circumstances that makes it necessary.
I really liked Marlan’s suggestion to secure your personal safety, particularly if it is a lead that did not come through an existing client.