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  • What's a Strain? for Kids


    A strain happens when a muscle gets stretched too far.

  • Pompe Disease for Parents


    Pompe disease is a rare genetic condition that makes muscles get weaker over time.

  • 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.

  • 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.

  • Myasthenia Gravis for Parents


    Myasthenia gravis (or myasthenia) happens when voluntary muscles get weaker. Treatments can help symptoms.

  • Bones, Muscles, and Joints for Teens


    Our bones, muscles, and joints form our musculoskeletal system and enable us to do everyday physical activities.

  • Bones, Muscles, and Joints for Parents


    Without bones, muscles, and joints, we couldn't stand, walk, run, or even sit. The musculoskeletal system supports our bodies, protects our organs from injury, and enables movement.

  • 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.

  • 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.

  • A to Z: Myalgia for Parents


    Learn about causes of muscle pain and conditions that affect muscles and muscle groups.