The Self-Defense Institute in Tewksbury, Massachusetts, established in 1999, is an accredited, professional, family-owned center for training in the Tewksbury, Massachusetts, area. Our professional, extremely experienced, and humble instructors are very skilled and patient at teaching students ages 4-18 and adults. There are no contracts and no down payment programs. You simply pay the monthly tuition of $99 at the first of each month. See more at https://www.tsdiOnLine.com