I became a interested in all sorts of foam rollers, massage balls, and other techniques to try to get my body back out of pain, tightness, imbalances and distortions. I have more rollers and other devices than many PT offices that I have been in. I think a few corners and closets in my house protect the huddled masses of all sorts of these implements and tools.
I had a few PT sessions with therapists who performed Graston or ASTYM therapy. The real basics are that they use speciallly made tools to scrape over your muscle tissue, tendons, or ligaments to address scar tissue and fascial restrictions. I have had it on my lower legs and feet as well as the hip area and back of the knee. The therapist rubs over the tissue. By the end of a treatment, you can be a bit sore and the tissue can be red and inflamed, but it does loosen things up quite effectively. One major reservation I have with these sessions is that it is usually limited to just one spot on your body. I would think that they would look over your whole body to find tightness and try to resolve them like a massage therapist would.
Mobility Star to try it out. I would caution against doing anything close to attempting what a trained therapist does, but I was curious about working on my own muscles. The Mobility Star is similar in some ways to the professional tools, but I do think the corners and edge surfaces are much rounder and more gentler on your body tissues. When researching before trying this out, I also found this inexpensive Kindle book, An Introduction to Instrument Assisted Soft Tissue Mobilization, which gives some excellent guidelines and directions if you want to try self-treatments. It goes over what to do for various muscles and I would consider it a must-have book if you are so inclined to try this.
In fairness, I have not really gotten deep into this as I am in a do-no-harm phase of just trying to keep my body pain-free. I do keep the Mobility Star handy for when a muscle feels tight. I find it much easier to use than a roller or a massage ball on tight muscles around my legs (like a strong thumb), particularly around my shins. It can get directly into any tight tissue that bothers me and it gives much better leverage. When I am slightly bothered by something that is tight, I just pull it out, work on the muscle for a few minutes, and usually I feel much better. I haven't used it much as the book suggests as a way to do ASTYM, but when I have, I do it very lightly as the book suggests. It is not about how deep you can go. One interesting thing to note is that you learn to feel the vibration of you tissues as the tool helps you find what needs to be treated.
I have also found similar and cheaper versions of this tool, like the EDGEility Tool, the Myofascial Releaser - MICRO Tool for IASTM, as well as Gua Sha Scraping Massage Tools . You can also find more expensive (and probably more precise tools).
Here is an introduction to the Mobility Star:
This video shows some techniques for using the Mobility Star:
Here are some more tips and techniques:
Good luck, if you try doing this. I think that someday, these or similar tools will replace the foam rollers and massage type balls that have become very popular today.