Forget everything you thought you knew about stretching injured or aging tendons! This article reveals that for conditions like Achilles tendinopathy, the real issue isn't tightness, but often an overly flexible or "compliant" tendon due to microscopic tears or age. This forces the calf muscles to operate in a shortened, weaker position. Aggressively stretching such a tendon would only worsen this problem.

Instead, research strongly supports using heavy-resistance, prolonged isometric contractions as a powerful way to actually tighten injured and aging tendons. This method can significantly increase tendon stiffness, allowing muscles to work more effectively and improve force output. Studies show remarkable results like increased Achilles tendon stiffness, improved running economy, and immediate, significant pain reduction in painful tendinopathy. These safe and effective exercises empower patients, decrease reliance on pain medication, and underscore that "Exercise is medicine".