As a senior with moderate arthritis, exercise has become a delicate balancing act. I need to move around to maintain some strength and flexibility, but too much stress on aching joints would send me to the couch. Walking is especially good and the Tendlite has helped ease the arthritis in my feet immediately. It took several days when I first got it, but now all I need is one treatment after a walk to completely stop the ache. I do have a suggestion for Tendlite...would it be possible to make an extension to attach to the light making it possible to reach awkward areas like shoulders and back?