There are some great responses here. I checked your site and it looks like you are doing very well. Try to join as many networking groups as you can, if you need more clients can also contact chiropractors, massage therapists, doctors and apartment complexes around your area. You can also join different meet-up groups, so you can do more networking and promote your business.
I hope this helps.
Know your limitations with time
If you are going to be an in home trainer try to schedule your clients who live near each other on the same day
Don’t think you always have to say yes to every one who wants to train, make sure it’s a good match.
Write down all of your travel expenses and keep track of your mileage and gas etc.
Offer small group training
Give your current clients your business card and let them know you have times available and that you love referrels
Offer a referrel card: refer 5 clients get 2 sessions for free
Join your Chamber of Commerce
Get involved in your community
Offer a student discount/senior discount?
Word of mouth is the best advertisement but you also want to let people know what you do and that you are available.
I looked at your profile and saw that you carry you own liability insurance. That is great. I assume that you also have registered your own business and that you are in compliance with all the rules of the state you live in.
I recommend that you have a few shirts that carry your company name (or your own name) and contact information. Wear it wherever you go, and also put a decal on your car. Never leave your home without business cards.
When you first begin with in-home training, you will be tempted to accept any time and any location. This can lead to a lot of running around and inefficiency for you.
I also recommend that you should be mindful that – wherever you go – you are always an advertisement for yourself. That also includes places like Twitter and Facebook.