@user-ch30d2d11 just saw this post Ive had my Tens unit for years The hand held unit vibrates electrical sensation and relaxes my muscles My chiropractor puts it on my back with ice or heat In summer,ice,but in winter ,heat, this is what I use I have a personal one I use at home .It will relax your muscles and all ,tissues ,nerves so they are free to move .Dr. Showed me where to apply the electrodes love mine.