"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Do you ever wake up with tight, stiff legs and wonder why? Or maybe, during yoga class, you find it ...

The hamstrings are a rare and unique lower-body muscle group that actually acts at two joints. Flexing your hamstrings will bend your knee, much as you do during leg curls. Your hamstrings also act on ...

The semitendinosus is one of the four muscles in the hamstring muscle group. The others are the semimembranosus and the biceps femoris. The semitendinosus is the longest of these muscles, and it runs ...

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 ...

You’ll know the feeling if you have tight hamstrings – your strides feel shorter, it seems like you’re working harder than usual and your legs feel stiff and restricted. Going faster or tackling hills ...

The hamstring muscle group is a common location for injuries among runners. Eccentric exercises are a key strategy to prevent and recover from hamstring issues. Since the hamstring muscle crosses both ...

Hamstring rehabilitation exercises can aid recovery and help prevent future injuries. Rehabilitation protocols typically call for a combination of stretching and strengthening movements. While severe ...

Oluseun Olufade, MD, is an Orthopedic Surgeon and Assistant Professor of Orthopedics at the Emory School of Medicine. Hamstring curls and Romanian deadlifts both strengthen the hamstrings, but they ...