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Actually, leg extensions and leg curls do not replicate squats at all. Look at lunges, both forwards and backwards lunges, and dumbell squats to take the pressure off your back. Also, review your form with your squats. You may have gotten sloppy. And if your hamstrings and calves are too tight, it can stop you from doing squats correctly. For a real challenge, if you have access to a Bosu ball, try doing dumbell squats on that with the platform side up and test your balance.
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