Instrument-assisted soft tissue mobilization, or IASTM, is a technique that therapists use in treating muscle or fascia-related problems. 

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Therapists would rub your skin using stainless-steel tools. Therapists would first locate the muscle restriction. The tools could penetrate closely to the fascia and allow therapists to treat the tissues directly.

During the therapy, it might cause pain as the therapist rub the skin with the tools. They would utilize the tools to stretch and break down the adhesions and scar tissues.

Studies have shown that IASTM technique would lower pain-promoting substances, and promote the rate and amount of blood flow around the area.