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Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. Ready for leg day?

Learn how to build the kind of definition that finally makes your quads pop.

If you’re a beginner, start with quad exercises that feature isometric holds (such as split squat isometric holds, isometric squats, and bear planks) to develop muscular endurance, stability, and ...