Hey John!
I decided to check this one out and there are no posts. Have you considered doing something with pedometers and steps for walkers. I am a PE teacher and did an experiment this past year at the school. I put on a pedometer when I entered the building and recorded my steps on a website called
www.peclogit.org. It is designed for students and teachers to record steps and chart their progress. I had 25 of my students sign up and it was great. I wound up walking over 800 miles just being at work last year. I'm going to do it again this year and thought that keeping track of steps might get you some more business. I would recommend the site to my students.
Keep up the great work and like I've said before, I love the site!
Erik