Most standard leg exercises are "missing" a very important quad muscle. Here's how to target it to build stronger legs.
Are leg extensions better than squats for building my quads? - Quora
Olympic Lifts and Dumbbells
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3 Ways to Do Leg Extensions - wikiHow
While pressing with leg press or hack squat, is it ok to fully extend your legs, or maintain a little bent legs all the time? - Quora
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My Case Against the Leg Press - Tony Gentilcore
Exercise First: Single Arm Cable Pulldown Cable workout, Back extension exercises, Exercise
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Don't waste time on useless exercise equipment: These gym machines offer an efficient workout - The Manual
Proformance Plus Plate Loaded Leg Extension / Prone Leg Curl (PPL-155)