I have noticed that though I still wake up some days with my neck hurting this does not continue for HOURS like it used to.
My right arm/shoulder gets hurting from overuse (playing Mahjong on my tablet) so I use my Posture Prep on it every day. The pain is not as bad as before. My swollen ankle (probably from my case of Covid-19 in Jan. 2020) still swells up but not as bad or for as long as before I started using the human PP on it. Wearing my BOT compression socks also helps but my ankle is not quite as bad as it was before I started using the PP on it.
I find that it works a little bit better if I used it up and down the length of the muscle fibers as well as diagonally. This is after I use it across the muscle fibers.
My neck is the big success story with me. I have been waking up with my neck hurting for almost 40 years since I had a drunk driver hit me head on one day as I was driving out to feed my horses. Nothing had worked on it as well as the PP.