First of all, what even is fascia? And why is Hammer scraping it? Fascia is your body's connective tissue that surrounds muscles and organs, which can sometimes tense up and lead to aches and pain. And while a method like foam-rolling can relieve muscle tension, a device like the definitely-not-FDA-approved Fascia Blaster — or whatever TF Hammer is using — can go a little deeper. But unlike foam-rolling, fascia scraping isn't relaxing at all. In fact, it can be pretty damn uncomfortable, with some users reporting major bruising