Testosterone is the main hormone responsible for the changes in boys.
It's completely normal for you to experience puberty at any point between the ages of 8 and 14, and these are some of the changes you may notice.
1. Shoulders get wider
Your body is filling out and changing shape during puberty, so you’ll notice your shoulders become wider.
2. Muscles get bigger and stronger
Your muscle mass is also building during puberty, so you’ll notice your muscles grow and strength improve, particular...
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