Raising your arms, changing clothes, reaching for items on high shelves. For these daily movements, it is important that your ...

Just like your last relationship, the shoulder is super complex. The shoulder capsule, a tough fibrous sleeve, helps to hold the ball-and-socket joint together. An inner layer, called the synovium, ...

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. We’re going to start ...