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. For strong, powerful ...

From running and jumping to walking and climbing stairs, your hamstrings support nearly every lower-body movement. Weak hamstrings are also linked to knee pain, muscle imbalances, lower back ...

Dana Santas, known as the “Mobility Maker,” is a certified strength and conditioning specialist and mind-body coach in professional sports. She is also the author of “Practical Solutions for Back Pain ...