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Beth Shubin Stein on Twitter: "Although the leg extension machine pictured may help to strengthen your quads, it puts TREMENDOUS pressure on the patella and can make knee pain worse. Strengthening is
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Knee Pain: Safely Strengthening Your Thigh Muscles | Journal of Orthopaedic & Sports Physical Therapy
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Knee health: The worst exercises for knees and how to know if your workout is hurting your bones - Times of India
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