Leg extensions seem to have a bad rep these days but are they actually any good for building upper leg muscles? - Quora

The Truth About Leg Extensions

Why are leg extensions a bad exercise? - Quora

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What exercises can I do besides squats and leg press to build

Your Definitive Guide to Leg Extensions

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Does running count as leg day? - Quora

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How to build leg muscle without weights in just eight moves - Quora