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Muscular dystrophy is a disease in which muscles of the body get weaker and weaker and may slowly stop working. Learn more about it in this article for kids.

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.

Is working out with weights safe for teens? The best way to build muscle tone and definition is to combine aerobic and flexibility exercises with the right kind of strength training.

Quadriceps contusions are common in sports that have a lot of direct contact or a chance of collisions or wipeouts. Find out what to do if you get one - and how to avoid them.

Find out what the experts have to say.

Muscular dystrophy is a disorder that weakens a person's muscles over time. People who have the disease can gradually lose the ability to do everyday tasks.

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.

Getting the right amount of exercise can rev up your energy levels and even help you to feel better emotionally. Find out why.

If the tendon just above your heel becomes swollen or irritated due to overuse, it can lead to a painful condition called Achilles tendonitis. Find out how to treat it - and prevent it.

Lou Gehrig's disease refers to a disorder called amyotrophic lateral sclerosis, or ALS. This disease damages the neuromuscular system, which allows the body to move.