Never start off with something too heavy right away. Go to your nearest running track and, with a friend, time your sprinting speed. With support and guidance, struggles can help your child build mental strength. Allow for explanations—​ {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/7\/72\/Build-Muscle-%28for-Kids%29-Step-1-Version-2.jpg\/v4-460px-Build-Muscle-%28for-Kids%29-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/7\/72\/Build-Muscle-%28for-Kids%29-Step-1-Version-2.jpg\/aid2506470-v4-728px-Build-Muscle-%28for-Kids%29-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

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\n<\/p><\/div>"}Educational website from one of the world's leading hospitals{"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/a\/a4\/Build-Muscle-%28for-Kids%29-Step-3-Version-2.jpg\/v4-460px-Build-Muscle-%28for-Kids%29-Step-3-Version-2.jpg","bigUrl":"\/images\/thumb\/a\/a4\/Build-Muscle-%28for-Kids%29-Step-3-Version-2.jpg\/aid2506470-v4-728px-Build-Muscle-%28for-Kids%29-Step-3-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

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\n<\/p><\/div>"}Educational website from one of the world's leading hospitals{"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/0\/0f\/Build-Muscle-%28for-Kids%29-Step-10.jpg\/v4-460px-Build-Muscle-%28for-Kids%29-Step-10.jpg","bigUrl":"\/images\/thumb\/0\/0f\/Build-Muscle-%28for-Kids%29-Step-10.jpg\/aid2506470-v4-728px-Build-Muscle-%28for-Kids%29-Step-10.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

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\n<\/p><\/div>"}{"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/a\/af\/Build-Muscle-%28for-Kids%29-Step-18.jpg\/v4-460px-Build-Muscle-%28for-Kids%29-Step-18.jpg","bigUrl":"\/images\/thumb\/a\/af\/Build-Muscle-%28for-Kids%29-Step-18.jpg\/aid2506470-v4-728px-Build-Muscle-%28for-Kids%29-Step-18.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

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\n<\/p><\/div>"}{"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/e\/e5\/Build-Muscle-%28for-Kids%29-Step-20.jpg\/v4-460px-Build-Muscle-%28for-Kids%29-Step-20.jpg","bigUrl":"\/images\/thumb\/e\/e5\/Build-Muscle-%28for-Kids%29-Step-20.jpg\/aid2506470-v4-728px-Build-Muscle-%28for-Kids%29-Step-20.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

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\n<\/p><\/div>"}Educational website from one of the world's leading hospitals{"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/b\/b5\/Build-Muscle-%28for-Kids%29-Step-21.jpg\/v4-460px-Build-Muscle-%28for-Kids%29-Step-21.jpg","bigUrl":"\/images\/thumb\/b\/b5\/Build-Muscle-%28for-Kids%29-Step-21.jpg\/aid2506470-v4-728px-Build-Muscle-%28for-Kids%29-Step-21.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

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\n<\/p><\/div>"}{"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/c\/c3\/Build-Muscle-%28for-Kids%29-Step-22.jpg\/v4-460px-Build-Muscle-%28for-Kids%29-Step-22.jpg","bigUrl":"\/images\/thumb\/c\/c3\/Build-Muscle-%28for-Kids%29-Step-22.jpg\/aid2506470-v4-728px-Build-Muscle-%28for-Kids%29-Step-22.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

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\n<\/p><\/div>"}Educational website from one of the world's leading hospitals{"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/0\/06\/Build-Muscle-%28for-Kids%29-Step-23.jpg\/v4-460px-Build-Muscle-%28for-Kids%29-Step-23.jpg","bigUrl":"\/images\/thumb\/0\/06\/Build-Muscle-%28for-Kids%29-Step-23.jpg\/aid2506470-v4-728px-Build-Muscle-%28for-Kids%29-Step-23.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

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\n<\/p><\/div>"}{"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/b\/b6\/Build-Muscle-%28for-Kids%29-Step-24.jpg\/v4-460px-Build-Muscle-%28for-Kids%29-Step-24.jpg","bigUrl":"\/images\/thumb\/b\/b6\/Build-Muscle-%28for-Kids%29-Step-24.jpg\/aid2506470-v4-728px-Build-Muscle-%28for-Kids%29-Step-24.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

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\n<\/p><\/div>"}For more from our Medical reviewer on building muscle, including by weightlifting once you hit puberty, read on!