Like other parts of your body, your muscles change over the years. “As you age, your muscle fibers become less dense, which makes them less flexible and more prone to injury,” says Elizabeth Gardner, ...

You’ve definitely felt it before: that mid-sprint twinge in your calf, the ache in your shoulders after a heavy lift, the stiffness in your elbow the day after tossing a ball around. Not quite an ...

Many of us wear backpacks whenever we leave home, so it's worth being safe. From kindergarten to high school to our first job or a big trip, we carry our lives in our backpacks. But while they’re ...