19525 Results in category Martial Arts Schools http://www.martialartsschools.directory/listing/guide/martial-arts-schools/page/2 Average 3 in each = 58575 and that doesn't include BOXING GYMS http://www.teamusa.org/usa-boxing/membership/find-a-club FITNESS GYMS http://www.gymsandfitnessclubs.com/gyms-by-location/ Or those that my want one for around the garage, basement, etc, theres potential to sell a 100,000 a year easily in the US alone. imo 100,000 X $299 = $29,900,000