BIOLOGY | MEDICAL | HEALTH on Instagram: "That deep, sore “knot” in your muscle is actually a bundle of muscle fibers that’s stuck in a constant contracted state. When your physiotherapist applies pressure, they’re forcing those fibers to finally relax. At first, it can feel sharp or burning—but that’s your nerves waking up and your blood flow rushing back into an area that’s been starved of oxygen. As the knot releases, fresh oxygen and nutrients flood the tissue, washing away built-up waste li