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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?

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 ...

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

Stretching isn’t the most exciting part of a runner’s routine, but the benefits of a good stretch can’t be understated. That doesn’t mean you need to plan an intricate routine to stretch for hours a ...