Search results
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What's a Strain? for Kids
A strain happens when a muscle gets stretched too far.
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Pompe Disease for Parents
Pompe disease is a rare genetic condition that makes muscles get weaker over time.
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Your Muscles for Kids
You have more than 600 muscles in your body! They do everything from pumping blood throughout your body to helping you lifting your heavy backpack. Find out more.
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Hamstring Strain for Teens
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.
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Myasthenia Gravis for Parents
Myasthenia gravis (or myasthenia) happens when voluntary muscles get weaker. Treatments can help symptoms.
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Groin Strain for Teens
A groin strain is when one or more of the muscles in the inner thigh gets stretched, injured, or torn. Find out what to do for groin strains.
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Why Exercise Is Wise for Teens
Getting the right amount of exercise can rev up your energy levels and even help you to feel better emotionally. Find out why.
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What Causes Muscle Twitches? for Teens
Find out what the experts have to say.
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Juvenile Dermatomyositis for Parents
Juvenile dermatomyositis (JDM) is an autoimmune disease that makes muscles, skin, and sometimes other organs become inflamed or damaged.
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Quadriceps Contusion for Teens
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.