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For tips on how to build Ageless Strength and Unlock Muscle Growth Over 50, check out my free Guide: https://fitand50.ca/free-guide-to-unlocking-muscle-growth-over-50/
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Do leg extensions really destroy your knees—or is that just gym folklore? Research and real‑world rehab practice paint a very clear picture.
Knee extension strength is crucial for knee health and performance, and leg extensions are one of the most direct ways to build that strength. They’re used in many knee rehab protocols to strengthen the quads and manage patellofemoral (puh·teh·low·feh·mr·uh) pain.
The key is technique and loading.
Use a controlled tempo and keep your working range between about 90 and 45 degrees of knee flexion, especially if you have knee issues.
Avoid snapping into a hard lockout at the top; instead, squeeze the quads and pause briefly under control. Start light, build up gradually, and pay attention to how your knees feel over the next 24 hours.
Leg extensions also hit the rectus femoris in a way squats can’t match, making them a powerful tool for complete quad development. Used intelligently, they’ll protect your knees, not wreck them.
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