I use it quite a bit in clinic as it's a nice compliment to ART. It can free up the superficial fascial restrictions quite well. The effects will last as long as the "offending activity" is avoided. You'll also have natural fibrosing of tissues which occurs as we age, so regular "maintenance" is required.
At worst there should be some mild bruising as some smaller blood vessels will break, but that should resolve quickly.
Make sure he keeps up with his regular, daily flexibility work. Glad to here he's improving.
I know Dave Graston who created the original and new tools.
Bill
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