To expand on what Ross said...to warm up for squats you use squats. By the time you actually START lifting all your muslces should be somewhat warmed up and the joints lubricated, etc...leg extensions and curls will do nothing but pre-fatigue the muscles. Never look at "warming up" as "isolating". You body works as a whole so warm it up the way it works.

Forward knee travel likely has nothing much to do with anything.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.