Part 4 of the passive modalities discussion will cover instrument assisted soft tissue mobilization (IASTM). This is the modality that the after effects are often displayed as a badge of honor on social media, but leaves us wondering if the person was a trauma victim or merely a trauma recipient. Clinicians today discuss the modality based on its ability to scrape, break-up, emulsify, release – almost any verb imaginable related to fascia, muscles, or other soft tissues. But does this modality really do anything? In this blog we will dive into the history and research of IASTM to find out.