It might not be the correct term, but my PT uses tiny needles and places them into my arm tendons (higher up). And then turns on electricity between the needles

It might not be the correct term, but my PT uses tiny needles and places them into my arm tendons (higher up). And then turns on electricity between the needles. I know a lot of serious athletes swear by it and I definitely feel the effects. It's hard to describe the sensation it doesn't hurt too much (though tapping into tight areas does hurt a bit). You can feel the change in how the tendon/whatever passes current when connected. Like at first when really tight the finger doesn't really twitch but after a bit when it releases it goes wild. Afterwards I'm weak for the afternoon and then feel looser after. I might equate it to an intenseness massage or Myofascial release treatment but highly specific for my inside the arm tendons. I recommend it, but I would think only with an actual Doctorate PT.