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The longest bones in your body are your femurs, which are located within your upper legs. Connected to your femurs are your quadriceps, which are behind practically every movement that you do. This is ...

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 ...

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?