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Did you know you have more than muscles in your body? They do everything from pumping blood throughout your body to helping you lift your heavy backpack. You control some of your muscles, while others — like your heart — do their jobs without you thinking about them at all. Muscles are all made of the same material, a type of elastic tissue sort of like the material in a rubber band. Thousands, or even tens of thousands, of small fibers make up each muscle. You have three different types of muscles in your body: smooth muscle, cardiac say: KAR-dee-ak muscle, and skeletal say: SKEL-uh-tul muscle.
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‘Anyone popular at school has muscles’: the rise of the ripped teen

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The most common causes of muscle pain are tension, stress, overuse and minor injuries. This type of pain is usually localized, affecting just a few muscles or a small part of your body. Systemic muscle pain — pain throughout your whole body — is more often the result of an infection, an illness or a side effect of a medication. Causes shown here are commonly associated with this symptom. Work with your doctor or other health care professional for an accurate diagnosis. Mayo Clinic does not endorse companies or products.
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A balanced exercise routine includes aerobic cardio activity, stretching, and strength training. Walking, running, and swimming are examples of aerobic activity. Aerobic activity strengthens your heart and lungs. Stretching improves your flexibility. Strength training uses resistance, like free weights, weight machines, resistance bands, or a person's own weight, to build muscles and strength.
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According to the study findings, about 35 percent of boys and 21 percent of girls in middle and high school said they had used protein powder or shakes during the last year to bulk up or tone their muscles. Six percent of boys and 4. And 10 percent of boys and 5. That's not all youngsters are doing to build muscle. Although these last two changes could be potentially healthy, the teenagers could also have modified their diets or exercise regimens in an unhealthy way, researchers said.
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