Your rectus femoris shuts down after 8+ hours in a chair. Your kneecaps pay for it every time you stand. Sitting all day does not just tighten your hips. It quietly wrecks your knees too. When you spend eight or more hours with your hips flexed at 90 degrees, the rectus femoris, the big quad muscle that crosses both the hip and the knee, shortens and weakens. It loses the ability to produce force through a full range of motion. The result is a quad that cannot properly stabilize the kneecap during stairs, squats, or even walking. Your body compensates by loading the joint itself instead of the muscle. That is when the aching starts. The Reverse Nordic is one of the fastest ways to reverse this pattern because it lengthens and strengthens the quad at the same time, in the exact range that sitting steals from you. This reel gives you three progression steps you can do on any padded surface with zero equipment. Save this for your next session. — Drop BASICS in the comments and I ...