Your skin is usually fairly elastic, but when you grow or gain weight really quickly (like during puberty), you may get fine lines on your body called stretch marks.

These videos guide you through 8 dynamic stretches that target different muscles and areas of the body.

You may have heard mixed things about stretching before working out. Here are the cold, hard facts on warming up, stretching, and cooling down.

A hamstring strain happens when one or more of the muscles in the back of the leg gets stretched too far and starts to tear. Find out how to treat hamstring strains in this article for teens.

This growth-related injury is more common in teens who play sports that require a lot of running or jumping. Find out why it happens - and what you can do to avoid and treat it.

Keeping an exercise log is a great way to stay motivated and reach exercise goals.

Soccer is easy to learn at a young age, and it's great exercise. But it's also a contact sport, and injuries are bound to happen. To help prevent mishaps, follow these safety tips.

A groin strain is a tear of one or more of the muscles that help you squeeze your legs together. Find out what to do for groin strains - and why it's important not to go back to sports or other activities too quickly.

The most obvious symptom of plantar fasciitis is a sharp pain on the bottom of the foot, near the heel. Find out how to tell if it's plantar fascitiis and what you can do in this article for teens.

Our skin protects the network of tissues, muscles, bones, nerves, blood vessels, and everything else inside our bodies. Hair and nails are actually modified types of skin.